In Season 1 Episode 19 of "Person of Interest", Elias kidnaps Carter's son, so Finch goes to Officer Simmons, who is part of H.R., a group of corrupt cops who are working with Elias at the time. The following conversation ensues.
Finch: Look, I recognize, Officer, that I'm placing myself in danger by sitting here with you. I need you to understand that you're placing your family in danger by doing business with Elias.
Simmons: What the hell is this?
Finch: The man following your wife is an ex-con whose prior convictions include rape, manslaughter Elias is keeping you and yours in check Until his plan is finished. After that Who knows whether he'll have any use for you.
Simmons: How do I know this guy doesn't work for you, huh? L
Finch: I imagine you don't. But are you really willing to bet your family's life on it?
Simmons: What do you want?
Finch: You need to get me the location of Detective Carter's son and call off any men you have working on Elias's behalf. HR severs its ties with Elias as of this moment.
And after that, H.R. does exactly what Finch asked them to do. So my question is, why did they do what Finch wanted? Did Finch offer them something in return? Otherwise how would it benefit H.R. to reveal the location of Carter's son?
Did Finch somehow manage to get rid of all Elias' people who were following the families of H.R. members? The show doesn't make that clear.
No spoilers beyond season 1, please.