Neil McCauley: Roger Van Zant?
Roger Van Zant: Yeah, who's this?
Neil McCauley: You know who this is.
Roger Van Zant: Yes I do, yes I do. I sent a guy to deliver the package. He didn't call, is everything all right?
Neil McCauley: Tell you what, forget the money.
Roger Van Zant: What?
Neil McCauley: Forget the money.
Roger Van Zant: Wh...it's a lot of money. What are you doing? What do you mean, forget the money?
Neil McCauley: What am I doing? I'm talking to an empty telephone.
Roger Van Zant: I don't understand.
Neil McCauley: 'Cause there's a dead man on the other end of this fuckin' line.
Vincent Hanna: Charlene Shiherlis.
Alan Marciano: Who?
Vincent Hanna: Who? Who? What are you a fuckin' owl?
Alan Marciano: Why'd I get mixed up with that bitch?
Vincent Hanna: Cause she's got a great ass. And you got your head...all the way up it.
Alan Marciano: Jesus!
Vincent Hanna: Ferocious, aren't I? When I think of asses...a woman's ass...something comes out of me.
Justine Hanna: I made dinner for us. Four hours ago. Every time I try to maintain a constant mood between us, you withdraw.
Vincent Hanna: I've got three dead bodies on a sidewalk off Venice Boulevard, Justine. I'm sorry if the goddamn chicken got overcooked.
Vincent Hanna: I'm very angry, Ralph. You know, you can ball my wife, if she wants you to. You can lounge around here on her sofa, in her ex-husband's dead-tech, post-modernistic bullshit house, if you want to. But you do not get to watch my FUCKING TELEVISION SET!
Answer: Waingro helped Van Zandt track down Trejo. Waingro then tortured Trejo and threatened his family if he didn't give up McCauley. With his back to the wall, Trejo gave Waingro and Hugh Benny the details of the bank heist, but Waingro killed Trejo's family anyway and beat Trejo almost to death. Benny then gives the tip to the police on Van Zandt's order.
BaconIsMyBFF
I wonder how Trejo was tracked, I don't remember his name being revealed during Waingro's time with the crew, or any other information.
Well, we never see the crew prior to their first heist. Trejo could have given Waingro his name during the planning of that heist.
BaconIsMyBFF
Waingro met this crew only once. How would he know who Trejo is or where he lives? Right before the heist, Trejo is asked to mislead police away from the heist.