A fired-up police Commissioner William G. Gross ripped into ACLU “paper warriors” for suing the city over a gang database, saying the civil rights advocates are turning a blind eye to “atrocities.”

“No ACLU present when we have to explain to a mother that her son or daughter was horribly murdered by gang violence,” Gross wrote in a scathing private Facebook post obtained by the Herald.

“No ACLU when officers are shot. No ACLU when we help citizens,” he added. “Despite the paper warriors, we’ll continue to do our jobs.”

READ MORE: The ACLU responds to Boston Police Commissioner William G. Gross

Gross was lashing back at the local chapter of the American Civil Liberties Union for being part of a public records lawsuit claiming Boston police are too secretive about how they monitor suspected gang members.

That system, the ACLU claims, targets, labels and investigates a disproportionate amount of black and brown students who may not belong to a gang.

Police spokesman Sgt. John Boyle said last night the commissioner “shared his opinion on his personal Facebook page.” He declined to comment further.

That post included Gross calling out the ACLU on a number of fronts — especially about the ruthless MS-13 gang.

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