BOSTON – Fired-up Boston 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 Boston 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.”

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, according to the Herald report.

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

Boston Police Commissioner

“No ACLU present when we have to explain to a mother that her son or daughter was horribly murdered by gang violence,” Boston Police Commissioner William G. Gross wrote in a scathing private Facebook post. (City of Boston)

Police spokesman Sgt. John Boyle said last night the commissioner “shared his opinion on his personal Facebook page.” As a result, he declined further comment.

“I sure as hell didn’t see the ACLU in El Salvador working to find a solution to our youth being inducted into the MS-13 gang.” 

– Boston Police Commissioner William G. Gross

However, the post reportedly includes Gross calling out the ACLU on a number of fronts — especially about the ruthless MS-13 gang.

“I sure as hell didn’t see the ACLU in El Salvador working to find a solution to our youth being inducted into the MS-13 gang,” said Gross.

Continuing, he said he actually traveled to MS-13’s homeland and “took a hell of a risk while doing so.”

MS-13 has been wreaking havoc in Boston with violent killings in Eastie, robberies, extortion, drug dealing and racketeering — with 49 gang members recently convicted, many of them facing life in prison.

Gross went on offense by saying he “didn’t see” the ACLU back police or 22 youth programs working together to curb the gang’s “atrocities.”

Gross also knocked the lawyers’ group for not having the “common decency” to call with condolences after a city cop was shot in the face.

“No ACLU when officers are shot. No ACLU when we help citizens,”

– Boston Police Commissioner William G. Gross

Officer John Moynihan was shot point-blank in the cheek by a convicted felon in March 2015 during a traffic stop in Roxbury. After remaining in critical condition, Moynihan made a miraculous recovery. Other officers killed the felon that day.

“I sure as hell saw a member of the ACLU in the background taking pictures as a certain group tried to crash through the crime scene three hours later,” Gross said of that day.

“No ACLU when officers are shot. No ACLU when we help,” he added in his post. “But always hiding and waiting for a slow news day to justify their existence.”

The lawsuit seeks records providing the demographics of the youths in their gang systems. The ACLU asked for the records in May and had not received “adequate response,” they claim.