A California man slugged a uniformed NYPD sergeant who tried to usher him out of a Times Square street in a caught-on-video attack early Tuesday -- part of a troubling trend of attacks on uniformed officials in the Big Apple over the past few days.

Police have identified one of the goons who beat and robbed an off-duty cop and stole his gun -- and busted his father for using the officer's stolen credit card.

An off-duty NYPD housing cop still in uniform had his gun and other belongings stolen after being brutally beaten and left unconscious Saturday in a Bronx robbery, police sources said.