Safwan Khan, 25, was in the crowd outside Greater Manchester Police's Rochdale divisional HQ on July 25.
They gathered after footage of an armed officer appearing to kick and stamp on a man's head during at incident at Manchester Airport emerged.
Minshull Street Crown Court heard crowds congregated from around 10pm.
Most were wearing masks and balaclavas. Missiles including eggs were thrown, with damage caused to a security keypad. The doors were blocked with fencing and road signs, the court heard.
Fireworks were also set off.
Khan, from Rochdale, was seen on CCTV and mobile phone footage wearing a tracksuit with his hood up. He and a group moved fencing to the front door.
He was seen throwing a traffic cone.
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