'Breakfast Club' star Anthony Michael Hall is being investigated for allegedly attacking his neighbor, leaving the man with a broken wrist and hurt back ... and it was all caught on tape.
Law enforcement sources tell TMZ ... Hall's neighbor called 911 ... claiming the actor violently shoved him to the ground, hurting him badly.
The alleged victim told cops ... the ruckus began when he left their condo gate open. The guy says Hall shouted to close the gate, came over and slammed it shut, and then melted down.
Check out the security footage ... it shows the 2 men in each other's faces when suddenly the alleged victim goes flying backward. Hall then storms away.
This isn't the first time AMH's been accused of being a bad neighbor. Condo residents claimed back in 2011 Hall scared the crap out of them, screaming obscenities and looking for fights.
We've reached out to Hall for comment. So far, no word back.