it is not biblically right. >> reporter: inside, a man who calls himself brother gary, the executive director. >> this boy here claims to be homosexual. >> reporter: he told our undercover team that for a $21,000 yearly fee, he uses a bible, and sometimes a belt, to deal with teenagers who consider themselves gay and act up. >> i wouldn't do it just because, for one, just because he says he's queer. i'm not going to do that. >> reporter: this is just one of a number of such places discovered by abc news in a yearlong investigation. including the facility behind this barbed wire, run by a so-called christian pastor, william knott, with a track record of cruelty who did not want to talk with abc news. >> i don't want to talk to you. >> reporter: why not? >> because i don't like you. get away from me. >> reporter: is this how you treat the young boys? >> this is how i treat you. get away from me. >> reporter: testimonials for knott's academy described as teens, gay and straight, getting