This was no figment of Ed Norton's imagination ... cops shut down a REAL illegal fight club in New York over the weekend -- allegedly turning up guns, drugs and more.
The New York City Sheriff's Dept. raided a commercial warehouse on Coster Street on Saturday night -- discovering more than 200 people packed inside to watch amateur fights at an unlicensed event dubbed "Rumble in the Bronx!"
Officials say 10 people were arrested -- including a man suspected of organizing the event. That dude faces 8 criminal charges including unlawful assembly and conducting a prohibited combat sport.