The Janitors (Hotline Miami)

The Janitors are the hidden true main antagonists of the videogame Hotline Miami.

Story
They were first introduced as the enigmatic masterminds who sent phone calls to the player character, Jacket, forcing him to assassinate members of the russian mafia hiding in Miami.

Throughought the game, the observe Jacket's progresses in secret, disguised as janitors.

It is eventually revealed that they are members of a ultranationalist terrorist Group called 50 Blessings, which aims to sabotage the relations between the USA and Russia, hoping to estabilish the USA as the most powerful country on Earth. They also sent phone calls to a man named Richter, blackmailing him into killing Jacket and his girlfriend.

Their actions led to dire consequences for America.