- "Friends. Brothers. Men of Gotham! I have funded you. I've protected you. I scratched your backs and kept you out of jail. Well, now, it's time to say thank you. Go show those little bitches you don't mess with Roman Sionis! Half a mill to whoever brings me the girl alive. The rest, you can kill."
- ―Black Mask giving a speech to his soldiers[src]
It is unknown when this criminal empire was formed, but Roman Sionis created this criminal empire by recruiting petty criminals and integrating other groups of criminals to make one big criminal empire.
At some point earlier within its creation, they allied themselves with the Galante Crime Family to massacre the entire Bertinelli crime family and obtain the Bertinelli Diamond, which could be used to further fund Sionis' criminal empire and rise to power in Gotham.
At some point after that, Sionis and his organization would develop a rivalry with the Joker's Gang. However, Sionis was too fearful to stand against the Joker or his right-hand woman/girlfriend Harley Quinn despite the annoying grievances she caused for him.
Against the Birds of Prey
Years after the Bertinelli massacre, the sole survivor Helena Bertinelli also known as The Huntress sought out to kill her family's killer and would soon discover that Sionis and his criminal organization were in league with her family's killers. Therefore, while tracking down and killing the members of the Galante Crime Family, she tracked down and killed several criminals affiliated with Sionis, including Carlo Rossi and Happy before joining Harley Quinn, Renee Montoya, and Dinah Lance to protect a young pickpocket named Cassandra Cain, who came into possession of the Bertinelli Diamond and became a target of Sionis.
After Helena killed Victor Zsasz - the last of her family's killers, Sionis arrived with all of his henchmen and ordered them to kill the Birds of Prey and capture Cassandra alive, telling them that whoever could would receive half a million dollars in return. Many of Sionis' henchmen were killed in the fight before the rest were knocked unconscious by Dinah's supersonic scream. With the rest of Sionis' henchmen taken out during a car chase, Harley confronted Sionis at a pier and was finally killed when Cassandra had secretly stored an active grenade in Sionis' jacket, resulting in him being blasted to bits while falling into the pier. In the aftermath of Sionis' death, his criminal organization was dismantled.
Behind the scenes
- In the DC Comics, Black Mask founded a large gang called the False Facers, or the False Face Society, an organization of criminals that are required to select a mask from Black Mask's collection and wear it at all times, like when on the job and in his presence.
- Hodson, Christina (writer) & Yan, Cathy (director) (February 7, 2020). Birds of Prey (And the Fantabulous Emancipation of One Harley Quinn).