bella and marta karoly. >> i was scared of getting in trouble all the time because they had this sensentrol and fear in the gym. >> reporter: for years she's been a singular voice, speaking out against the karolys and the empire they helped build, usa gymnastics. >> i've been speaking for ten years and people are finally listening. >> reporter: this week she testified on capitol hill. >> i have firsthand knowledge of how the culture set the stage for other atrocities to occur. it is a culture of fear, intimidation, humiliation. >> reporter: standing with her fellow champions jamie dantcher and jessica howard, saying that culture created an environment that allowed their team doctor larry nasser to sexually abuse them, and many others. >> i trusted usa gymnastics. but i was sexually abused, as were so many other athletes. >> dr. nasser abused me at the national training center in texas. worse, he abused me in my hotel room at sydney, the olympic games. >> reporter: nasser was the head physician for team usa gymnastics for 19 years. you can see him here after carrie injured her ankle in

. >> reporter: she says her fate was in the hands of bella and marta karoly, known for their brusque e and uncompromising methods. they coached the likes of simone biles to greatness. >> power through everybody -- >> reporter: for the lucky ones the road to olympic stardom led to the karoly ranch in texas. when dominique arrived there as a young teen it wasn't what she imagined. >> a lot of athletes weren't smiling, weren't happy. it just -- right away when i walked in the gym i felt like the sense of coldness. >> reporter: she says when gymnasts were injured they were pressured to keep training. >> as if you, the athlete, were weak if you spoke up and said, i'm hurting. you are not allowed to say, i'm hurting. and so that creates a cycle of psychological warfare in a way. i got humiliated. i was mortified. >> reporter: mochianu says this culture of shaming and fear was ultimately to blame for the recent allegations of sexual abuse against dr. that is nasse >> we were around a lot of adults that were kind of cruel. so it opened the door for a predator to start grooming and being your