here's edie falco throwing out the first pitch. >> jimmy: that's not bad. yeah.wing it out. >> jimmy: there you go. [ laughter and applause ] wow! wow! >> yeah. i know he's a tough guy and everything but -- >> jimmy: now that was, yeah, that's -- yeah, that was unbelievable. well i just happen to have a a baseball and a mitt here. >> oh my gosh. will you look at that. >> jimmy: and i'm just wondering if maybe you could throw out a pitch to our pal jeremy renner and he can catch. i'll be umpire. >> okay. sure, why not. >> jimmy: you ready to do it? >> what do i do? >> jimmy: you take the glove and the ball you go over there to the pitcher's mound. >> i have to walk over there. >> jimmy: i'll be back with jeremy and call a strike or ball. but, hopefully you go for the strike. this is edie falco pitching, ladies and gentlemen, for the "tonight show." [ cheers ] you're the coolest. i love you. here we go. strike! that's what i'm talking about right there. [ cheers and applause ] ♪ why we do this stuff? you're the best. come on. you're the greatest. edie falco. don't

tonight, join jimmy and his guests -- jeremy renner, edie falco

but falco doesn't think so. >> no i know what started it. i actually know. what happened is this club this motorcycle club in texas called the cossacks decided that they were big enough now to go ahead and wear the texas bottom rocker and basically tell the bandidos that they were ready for war against them. >> so this is a territorial fight? >> yes. it's all about their colors and the state bottom rocker. >> the bottom rocker is the name of the state worn on the jacket to indicate the territory they claim. while this is the worst violence the country has seen in years affiliated with biker gang this is surveillance video showing the chaos in a nevada casino as three people are killed in 2002. >> shots are being fired inside the hotel. people are being stabbed. >> rival gang members shoot it out, leaving the casino crowd dodging bullets. police forcing everyone to the ground as they sort suspects from victims. then in 2011, another casino in sparks nevada when it's over a member of the hells angels is shot dead by a rival gang. and the violence hasn't stayed

charles falco is a former atf contractor who spent years trying to take out these gangs. he requested we not show his face. >> i'd say half are full-time criminals where they are selling dope, drugs, involved many prostitution or illegal gambling any other types of crimes you can think of. for them they are outlaws. that's what they are. >> reporter: in the u.s., biker grouches are notorious for run ins with the law. in 2013 in new york a group of bikers pulled a man out of his car and beat him after he hit another biker. the driver testified about that attack. many of these biker groups aren't gangs and consider themselves motorcycle enthusiasts that enjoy a good ride. >> now everyone across the nation thinks when there's a pack of bikes it's a bunch of hooligans looking to beat up women and rape children. it's not like that. >> reporter: "nightline" spent four days riding with bikers in charleston south carolina who were not affiliated with gangs. >> what do you say to people at home? a lot of people say aren't you putting people in danger. >> the guy on one wheel has m

tonight, join jimmy and his guests -- jeremy renner, edie falco musical guest, tori kelly,

. >> my name is michael falco from new york city.l war 150 pin hole project. i'm attending re-enactments as a 19th-century photographer. photographing those re-enactments as if the photographer was in the battle with the soldiers and trying to bring a little bit more imagination to the subject. >> why pin hole? >> i find pin hole camera there's no lens on this camera and so it creates these really kind of blurry soft focused images that i believe lends some imagining to this period and the pictures that i've been taking for the last few years. if you look at the pictures you really can't tell what century you're in. that's one of the things i wanted to play with and this whole idea this civil regard landscape that exists in this country still alive and well. you can visit the battlefields. those battlefields and 19th-century landscapes are in our midst. they've been protected for 150 years. many re-enactors are descendants of men who fought in this war. there's a cultural connection, 21st americans returning to this battlefields to c

. >> my name is michael falco from new york city.king on the civil war 150 pin hole project. i'm attending re-enactments as a 19th-century photographer. photographing those re-enactments as if the photographer was in the battle with the soldiers and trying to bring a little bit more imagination to the subject. >> why pin hole? >> i find pin hole camera, there's no lens on this camera and so it creates these really kind of blurry soft focused images that i believe lends some imagining to this period and the pictures that i've been taking for the last few years. if you look at the pictures you really can't tell what century you're in. that's one of the things i wanted to play with and this whole idea this civil regard landscape that exists in this country still alive and well. you can visit the battlefields. those battlefields and 19th-century landscapes are in our midst. they've been protected for 150 years. many re-enactors are descendants of men who fought in this war. there's a cultural connection, 21st americans returning to this

tonight, join jimmy and his guests -- jeremy renner, edie falco musical gues

. >> reporter: 13-year-old owen falco ended up in george doun hospital after practicing lacrosse. >> i threw the ball. >> reporter: went terribly brong. >> it bounced over our fence. whennive bent over to pick it up. >> he got bitten by a cotterhead snake. >> reporter: it happen nd the yard of his calvert county home. >> the dad told me that the area where they live actually used to be called copperhead hill. >> we didn't know that at the time we bought our house. >> reporter: mom saw him first. >> i knew he knew what it looked like. >> he'll never forget this particular snake. >> it looked like it was curled up and it just kind of looked really mean. >> reporter: air lifted to georgetown hospital. >> it was turning black and blistering. >> reporter: it was a race against time. >> it feels like it's just really, really heavy and that there's a lot of pressure inside that's just trying to escape. >> reporter: but after a dose of ant die venom and surgery -- >> you okay buddy? >> reporter: -- it looks like he's going to be fine and he's decided to avoid those woods near his house from

. >> charles falco and an author and now consults for law enforcement on biker gangs, and said a month ago he was asked to go to waco because of growing tensions between two gangs, the bandidos and the cossacks. >> the bandidos are the biggest motorcycle gang in texas and they don't allow other motorcycle gangs to enter that state. >> reporter: this is the worst violence seen in years affiliated with biker gangs. this is the chaos shown in a nevada casino as three people are killed in 2002. >> shots are being fired in the hotel. people are being stabbed. >> reporter: rival gang members shoot it out, leaving the casino crowd dodging bullets police forcing everyone to the ground as they try to sort suspects from victims. in 2011, shots fired at another casino, this time in sparks, nevada, when it's all over, a member of the hells angels is shot dead by a rival gang. the violence between gangs hasn't stayed just in the u.s. violence exploded between the bandidos and the hells angels. at one point the bandidos accused of using a car bomb and a rocket propelled grenade against their rivals.

. >> reporter: charles falco is a former atf contractor who took years to take out the gangs.quested we not show his face. >> at least half are involved in some sort of constant criminal activity. >> reporter: according to the department of justice, there are more than 300 so-called outlaw motorcycle gangs across the country with thousands of members. but the bandidos along with four other biker gangs are classified as a serious national domestic threat, the feds say, involved in everything from drug trafficking to prostitution. two big questions this morning. how will prosecutors try all 170 people in custody? and will they pursue the death penalty? george. >> okay, philip, thanks very much. >>> we're going to turn now to the major military victory for isis. the terror group on the move in iraq, taking control of the key city of ramadi where hundreds of civilians and soldiers have been killed in fierce fighting. you see this new video right here showing trapped officials being rescued. martha raddatz is covering the offensive from washington. martha, u.s. officials can see th

. >> charles falco, thank you very much. thank you for agreeing to come on even with your concerns. and we'll stay in touch off television so you can let us know what's going on. appreciate it. >> thank you, sir. >>> alisyn. >>> another top story we're covering. the fbi finding no evidence of bullets being fired at the train before that crash. the engineer's actions remain the key focus. cnn's erin mclaughlin has the latest for us from philadelphia. what are we learning erin? >> reporter: hi alisyn. well at the heart of this mystery is why the train accelerated. so the focus very much is on 32-year-old engineer brandon bostian. a source with knowledge of the investigation say the possibilities range from human error to something more intentional. let me take you through some of the ntsb's latest findings. yesterday the fbi looked at that circular marking on the windshield and concluded it was not from a bullet. bostian also did not tell the dispatch the train was hit by an object prior to the crash. and so far there's no indication of mechanical failure. but authorities say they are