Former Gambino crime family button man Anthony Senter, 68, behind bars in Canaan, PA, was recently given the green light for release by the U.S. Parole Commission.

“The Commission determined that he had substantially observed the rules of the institution and that his release in June 2024 would not jeopardize the public welfare,” a Department of Justice spokeswoman told The Post.

But that’s a far cry from how federal authorities once viewed Senter, who was sentenced to life plus 20 years in 1989 after being convicted for participating in at least 11 murders.

Senter, along with six other mobsters, was also hit with racketeering charges, including narcotics trafficking, auto theft, loan sharking and extortion.

Senter was a member of a mob crew working under Roy DeMeo, a Gambino made man.

The crew operated out of the Gemini Lounge at 4021 Flatlands Ave. in Flatlands, Brooklyn, where many of their murders were committed during the 1970s and 1980s.

Federal and city authorities traced at least 75 deaths and disappearances to DeMeo’s crew — and independent researchers put their brutal toll at more than 200.

Rudy Giuliani, the then-U.S. Attorney for the Southern District of New York who initially brought the case against Senter and 20 other Gambino family members and associates — including then-godfather “Big Paul” Castellano — was astonished by the parole decision.

Senter “should die in jail,” Giuliani declared. “He displayed, without exaggeration, wanton disregard for human life.

“He was a stone-cold killer who liked to kill,” the former prosecutor said. “And I believe he liked to participate in some ways in the dismemberment of the bodies that took place afterwards.”

The Canarsie-born Senter was the son of Italian immigrants who had anglicized their original family name of Sente.

He and another crew member, longtime pal Joseph Testa, spent so much time in their boss DeMeo’s gin-mill hangout that they became known as the Gemini Twins.

“Gemini Lounge everybody knew was a house of horrors, don’t go in there, you might not come out,” recalled Curtis Sliwa, founder of the Guardian Angels, who grew up playing stickball with Senter in Canarsie.

He and another crew member, longtime pal Joseph Testa, spent so much time in their boss DeMeo’s gin-mill hangout that they became known as the Gemini Twins.

The future killer was widely known around the neighborhood as a hothead.

“He truly could flip the script — he could be having a conversation with you, and then all of a sudden one little thing would set him off,” Sliwa said. “Oftentimes Joey Testa would have to calm him down.”

DeMeo, who worked as a butcher’s apprentice before launching his criminal career, used his early training to devise a grisly murder procedure — later dubbed “the Gemini Method” — that Senter and the others gleefully followed.

Former gang member Dominick Mantigilio testified in Senter’s trial that those targeted for death would first be lured to an apartment-turned-abbatoir next to the Gemini Lounge that had been rented by mobster Joseph “Dracula” Guglielmo.

“When the [victim] would walk in, somebody would shoot him in the head with a silencer,” Mantigilio told the court. “Somebody would wrap a towel around to stop the blood and somebody would stab him in the heart to stop the blood from pumping.”

Crew members — often clad only in their underwear, to avoid staining their clothes — would drag the corpse into the shower and let it bleed out, like a hog in a slaughterhouse.

Then they would “pull him out, put him on a pool liner in the living room, take him apart, and package him,” Mantigilio said matter-of-factly.