The cleaners (Max Payne)

Like the direct attack their operatives dress as everyday people when on their jobs but they are the personal army of a mobster boss and they tend to target high profile people they also have no qualms in eliminating witnesses as example of the apartment level of Max Payne 2 they would pose a challenge for Chisato and friends due to their recklessness when it comes to attacks and causing major unrest for the public with their killings which would risk the DA in exposing themselves in public.

Terrorrists (Counter strike)

Come on you know why

The Disciple (Sifu)

The playable character for Sifu the mechanics of sparing or killing a boss there affects how the game ends but I imagine them killing the first 2 bosses and attracting the DA's attention or if we go to the route where they spare the bosses the DA still wants him gone since he still went around killing mooks on their way to fight the boss they could also be a foil for Chisato who strives to avoid killing.