In This Is The Police, there are multiple factions that allows for interaction.
Freeburg Police Department
The Sand Mafia
Robespierre is the alias of the businessman Eugene Chaffee, who challenges the corrupt Mayor Roberts for leadership of the city.
There are also minor gangs in Freeburg that commit different crimes.
This is all the gangs, mafias, and other lawbreaking factions that exist in Freeburg:
The Labor Union
Helps Jack getaway with questionable city hall requests and allows Jack to fire his employees without consequence.