What is "gangbusters"

to come on like gangbusters (c.1940) is from popular U.S. radio crime-fighting drama "Gang Busters" (1937-57) which always opened with a cacophony of sirens, screams, pistol shots, and jarring music.

a. very successful or profitable n. (plural of gangbuster English)

Gangbusters was a historical roleplaying game designed by Rick Krebs (based on his original game called "Bloody 20's") with Mark Acres assisting in its development. The game was published by TSR, Inc. Two editions of the game were published. The first edition of the game was published in 1982.

Gangbusters is a game about crime in the United States during the 1920s and 1930s. Players take the roles of criminals, law enforcement professionals, or other characters (such as newspaper reporters) who investigate or oppose criminals. An emphasis is placed on the violent growth of organized crime during Prohibition. Political corruption is also a recurring theme.