Those looking for dirty deeds to be done seem to be going no further than the Comm, a series of Discord communities in which people order violence, including commissioning robberies for bitcoin, and organizing swats against vulnerable people for perceived slights and insults. For Vice, Joseph Cox infiltrated this vile, testosterone-fuelled world of crime.
In the Comm there are the people who order the violence for whatever reason, and then the people willing to provide it as a service. I found various Telegram channels run by groups offering their IRL violence services. One called Bricksquad offers to throw bricks at a target building. It also advertised services in which they would shoot a house or car; commit an armed robbery; stab someone; “jumping (multiple people)”; and “beating (singular person).”