Finn himself, even though just an organizer, knew exactly how to handle people, that is his profession and he already did some… well, cutting, if that's how people call it.
He cut off some people who didn't do the work they were supposed to, especially those who thought from the beginning that the family is just for quick money and dip the fuck out… no, no, James didn't even know about the "hunters" they have.
Basically, it's a unit that Finn himself organized with Hector. Those hunters only job is to literally hunt down those who dip from the family or stole from the family as quickly as possible, and believe me, when they find a person, they not just kill him but make their life well bad... they torture, they cut, they chop.