Influencer Bradley Martyn Sued by Man Claiming Security Bashed Head Into Pole

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Bradley Martyn -- the famous fitness influencer known for starting ZOO Culture -- is being sued by a man who says Martyn's security got rough with him ... slamming his head into a pole for no reason.

Charles Mancusco says he attended an event at the popular Encino gym back in January for the gym's 2-year-anniversary ... an event he says was open to the public.

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During the event, Mancusco says he thinks Martyn and others at ZOO Culture created a frenzy by distributing free promotional materials ... while also encouraging people in attendance to use drugs and wrestle.

At some point during the night, Mancusco says he and a group of others…