this is "nightline." >> tonight, the brothel next door. an undercover investigation into the shocking truth about prostitution on american streets. where young women are bought and sold in broad daylight. we are on the trail. what we were offered in just a few minutes for just a few bucks. plus, dancing at dawn. they're sweating up a storm all before you've had breakfast. the hottest new trend that's got these party people chasing a natural high. and watch out for jaws. did the bad boy of soccer bite again? what happens next after an extreme foul on the field? but first, the "nightline" five.

heat shields are compromised. we what's that alarm?ures. fuel cell two is down. i'm going to have to guide her in manually. this is very exciting. but i'm at my stop. come again? i'm watching this on the train. it's so hard to leave. good luck with everything.

watch tv virtually anywhere with the u-verse tv app. with at&t, the u-verse revolves around you. good evening. tonight, an undercover investigation reveals the scale of prostitution on american streets with shocking results. just in the last 72 hours, a

major fbi sting prerescued 168 children from sex trafficking. now our sister network fusion brings us a rare inside look at a working brothel, a world where young girls are bought and sold in broad daylight. ♪ >> reporter: we're on the trail of an international trafficking ring. >> reporter: my colleague is wearing a hidden camera to try to get a look at their product -- sex slaves. she was just walking down the alley with that guy. >> i'm not sure how safe this is. >> reporter: the sex slaves are height here in your backyard. girls as young as 12, from south

america, and trafficked to cities all over the u.s. >> are the girls here pretty? >> yes. >> this is nothing more than modern day slavery. wars have been fought to end that in this country. this is not something we can tolerate in america. >> reporter: on this night, we're in houston, texas, filming as a multiagency operation targets a sophisticated network of traffickers and pimps, doing business here in the suburbs. we got a firsthand look inside a brothel, just minutes after it was shut down. >> as you can see, you've got beds that are here. this is just a makeshift type bed with a drape for a little privacy, but not much. >> this was a room, so a little bit more privacy. >> reporter: so just basically a mattress, a small bed. >> what we have is places like

this, we have a ledger of girls that work here. the xs are the amounts of tricks they've done tonight, and they will pay him a fee, and grab a napkin, condom, this gel and go to the room. and dozens of men coming in and out of maces like this? >> uh-huh. and women having sex, 15 minutes and then just go on to the next guy. >> reporter: authorities believe many of these women could be sex slaves. brought to the u.s. against their will. they are the merchandise bought, sold, and traded by a vast international network of human traffickers and pimps. is this a profitable business this >> it's the fastest growing criminal enterprise in the world. think about it, drugs, you sell once. women and children, you sell time and time again. >> reporter: during this raid,

many of the women and their clients are arrested. but the pimps who traffic them remain free. the sex slave trade is a global business, and the american market is dominated by pimps and traffickers from one mexican state. no mace in the world sends more sex slaves to the u.s. at the center is one small city. >> it disturbing on many levels. they're family led organizations that specialize in trafficking young girls, prostituting them in mexico, bringing them to the u.s. >> reporter: the ring has spread throughout the u.s. from the border towns up thu texas and california and up the east coast, all the way to new york. the trafficking ring's hub is in

carona peach. this is the end of the road for a lot of girls. >> sex trafficking is happening right here? >> yes. >> reporter: el vin hernandez is an investigator for the department of homeland security, which coordinates international anti-sex operations. he's helped rescue dozens of women from neighborhoods just like this one. this is a house? >> yes, this is a house right here. it's right across the street from a public school. they can house themselves anywhere. if you're not aware of how traffickers operate, you're not going to think anything is wrong. it's just the normal course of the day. >> reporter: what do you see on a regular day here? >> on a regular day, these streets would be full. guys would be hanging out on

corners, handing out cards to find clients to bring to the brothel houses. >> this is basically the length of walking i'm going to be doing. >> reporter: we want to see inside the u.s. operation. so we send our colleague out into the busiest part of queens, new york, with a hidden camera, to see if we can get an extremely rare look into a working brothel. >> i'll try to have a long conversation, all right? >> yeah. >> do you see him? okay, so they went around the corner. they're going down this street.

>> are the girls here pretty? >> yes. >> yes? she's one of them? >> hello, how are you? >> good, thank you. okay. >> i think maybe it's time for him to come out. >> reporter: we're all feeling nervous about his safety, so i call him and pretend to be his wife to try and get him out of the brothel. >> hi, honey, how are you?

i'm okay. i'm okay. i should probably head back. >> we're going to be on 37th and 81st, okay? see you there. coming in. >> so i'm still rolling. all right. >> it was like, the basement of a house. you could -- the walls were very bare, and you could hear clearly people having sex. there was a steady stream of men coming in and out of there. >> reporter: we can tell you that this brothel is right in the heart of an area on an international law enforcement watch list, an area where pimps from mexico bring their girls. and this woman was one of them. she's agreed to talk to us as

long as we disguise her face. >> even on a day like today where you're with us, and you're disguised, you wouldn't feel comfortable walking down the streets of queens? >> by now, i'm a little bit squared. >> reporter: for years, she was held captive by a single pimp and forced to work these streets as a sex slave before she managed to escape. >> he made me to work almost 24 hours. i saw around 60 -- >> reporter: men a week? >> no, per day. >> reporter: 60 men per day? >> yes. so by the end of the day i was meeting. >> reporter: do you think more

should be done around the united states to combat sex slavery? >> i79's going to take a lot of efforts. it's a problem that calls for many, many types of solutions. i think awareness has to be raised, that this can be going on underneath your very nose and people don't know about it. >> for more on this powerful fusion investigation, check out fusion.net. up next, getting started just from the old ones used to finish at dawn. meet the ravers who get up with the roosters. and belly pain feel like a knot. how can i ease this pain? (man) when i can't go, it's like bricks piling up. i wish i could find some relief. (announcer) ask your doctor about linzess-- a once-daily capsule for adults with ibs with constipation or chronic idiopathic constipation. linzess is thought to help calm pain-sensing nerves and accelerate bowel movements. it helps you proactively manage your symptoms.

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who needs drugs when you can get a natural high? that seems to be the newest mantra of dance partiers. but it might come as a shock they're heating up the scene before breakfast. before these ultramotivated party people, there is no rush better than endorphins. >> reporter: if you asked most clubgoers what are the best

ingredients for a rave, they would tell you drugs and darkness. but what if you held a rave without all that? this is a sober morning dance rave. and here no one is running through the streets of brooklyn high on crack like shoshana. so are pop up morning raves the next bingest thing? from london to barcelona to new york, they seem to be expanding glory. they are putting together last-minute details. >> it was introduced to london haste may. >> reporter: now the london morning glory dance group attracts close to 100 ravers at a time. >> it worked so well in london last year, it's scary bringing something like that to new

cities. >> rules are sew pobriety and authenticity. >> it gets sweaty. >> i'm like, is everyone going to get out of bed? >> reporter: in just two hours, this empty loft space will be filled with hundreds of bodies. getting dressed for a morning rave is harder than you might think. >> it's a quarter past 6:00. i'm running about 15 to 20 minutes late, as usual. >> reporter: these sisters literally cannot wait to get their dance on. are you how feeling this morning? >> great, excited. >> reporter: this morning's rave has yoga classes, massage stations, and if you feel so inclined, you can hoola hoop. >> i always have a huge sense of responsibility that i carry with me, because i know that my music is guiding everyone's

experience. in this day and age of crazy a.d.d. technology, it's a practice, it's a discipline. it's so much about being silly, rediscovering fun and playfulness you had as a kid, which is liberating and empowering to know that you can have natural highs. it's fun. >> there's no alcohol and there's no judgment. just go for it. >> reporter: what did you think of this today? >> i mean, besides the incredible vibe in there, dancing with this kind of view is something you just don't get any other time of the day. >> this is like it's a way to get together and exercise before you start your day. >> reporter: burning some calories today. >> totally. and we have hundreds of parties going on every single thigt in new york city. why aren't people getting together in the morning? >> reporter: two hours later as people head to work, we catch up with the organizer.

how did it go, hladies? >> it went really good. >> reporter: and in just a few hours, people on the west coast will be lining up to rave into the day for the first-ever morning gloriville in san francisco. for "nightline," i'm linda janice in new york. up next, playing dirty at the world cup. the soccer star living up to his reputation as the cannibal. spokesperson: the volkswagen passat is heads above the competition, but we're not in the business of naming names. the fact is, it comes standard with an engine that's been called the benchmark of its class. really, guys, i thought... it also has more rear legroom than other midsize sedans. and the volkswagen passat has a lower starting price than... much better. vo: hurry in and lease the 2014

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the referee missed it. but nobody else did. one world cup soccer star taking a pit out of another during their match today. so what happens when playerslea field, including teeth marks? >> a slash inside the penalty area. >> reporter: usually the no biting conversation is limited to animals and small children. not stars of the world cup with millions watching. >> it looks to me, dare i say, he's had a little bite. >> reporter: yes, that's uruguay star luis suarez, apparently biting an italian defender. his nickname was already the cannibal. because this is his third, yes, third biting incident. first in 2010 in the dutch league. then again as seen last year against chelsea, his carnivorous

appeti appetite. fans here, though, defend him. you think it was okay that he bit anymore >> yes, for sure. >> reporter: american fans, on the other hand. twitter went into a teething frenzy. evander holyfield, tweeted i guess any part of the body is up for eating. although the cameras caught him, the referees did not. no card was given. even with the defender desperately showing the scene of the crime. meanwhile, as the world jokes, and even paints their toothy image, uruguay moves on to the knockout round, with or without their hungriest mare. >> and finally tonight, big news from right here at abc. today our network announced the haunch of abc news on apple tv.

abc news will put up live and on demand video and original digital programming. thanks for watching abc news. good night, america.