
1) Great guns 2) Historical role-playing game 3) Radio adventure series
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https://www.crosswordclues.com/clue/gangbusters
[role-playing game] 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...
Found on
http://en.wikipedia.org/wiki/Gangbusters_(role-playing_game)
[video game] Gangbusters is a Commodore 64 game about the American Mafia that begins during the start of Prohibition in the early 1920s. A complete set of documents were included with the game that taught the players the complete glossary of the Mafia `language.` The game appeared on the December 1982 issue of The Rainbow. Due to various gl...
Found on
http://en.wikipedia.org/wiki/Gangbusters_(video_game)

Gangbusters is American slang for something excellent, or impressive.
Found on
http://www.probertencyclopaedia.com/browse/ZG.HTM
No exact match found.