NEW YORK — A former member of a black radical group who was convicted in the 1971 killings of two police officers has been granted parole after 44 years behind bars for a crime that crystalized an era when militant groups declared war on authorities.

Herman Bell’s supporters, including relatives of one of the slain officers, said the 70-year-old was a model inmate who deserved freedom. But the other officer’s family, the New York police union and some lawmakers called Bell’s parole an affront to police who sacrificed their lives for public safety.

Bell had been denied parole seven times before. But in a decision released Wednesday, a parole board said Bell’s “debt has been paid to society” after he admitted his crime, was productive in prison and amassed supporters including relatives of one of the slain officers.

“Your crime represents one of the most supreme assaults on society,” the panel wrote, but his release will “denote rehabilitation as core to our system of criminal justice.”

Bell remains behind bars at an upstate prison until at least April 17. His lawyer, Robert J. Boyle, said he had satisfied all the criteria for parole and “in our view, justice was served.”

Officers Waverly Jones and Joseph Piagentini were shot multiple times after responding to a report of a domestic dispute at a Harlem public housing complex on May 21, 1971. Prosecutors said it was a trap set by Bell and co-defendant Anthony Bottom, who also was convicted and is serving 25 years to life but is due for a parole hearing in June.

Bell and Bottom were members of a violent offshoot of the Black Panther Party called the Black Liberation Army. The group sanctioned symbolic killings of police officers, regardless of their race, in New York and California and robbed banks to finance its activities, authorities have said.

For years, Bell, Bottom and a co-defendant who has since died in prison claimed they were innocent and had been framed by the FBI. Declassified documents show the federal agency had initiated a covert campaign to infiltrate and disrupt the Black Liberation Army and other violent radical movements.

In 2007, Bell and Bottom accepted plea deals and got probation sentences for their roles in the killing of San Francisco police Sgt. John Young inside a stationhouse in his city in 1971.

Then, in 2012 New York parole board interviews, both men admitted their roles in killing Piagentini and Jones.

In a parole board interview this month, Bell said “there was nothing political about the act, as much as I thought at the time.”

“It was murder and horribly wrong,” he said, according to the parole board decision. “It was horrible, something that I did and feel great remorse for having done it.”

That didn’t change Diane Piagentini’s opinion of his release, which she said “devalues the life of my brave husband.”

“How can we ask our police officers to risk their lives to protect society when society fails to appropriately punish their animalistic killers?” she said in a statement released by the Patrolmen’s Benevolent Association, a city police union.

Union president Patrick Lynch said members “are disgusted, offended and extremely angry with this parole board’s decision.”

Some state Republican lawmakers held a press conference in January exhorting New Yorkers to sign a petition opposing Bell’s release. Republican U.S. Rep. Pete King, whose father was a police lieutenant who attended the officers’ funerals in 1971, on Wednesday called Bell’s parole “a shameful insult” to their memory.

But Jones’ family backed Bell’s release. The slain officer’s son, Waverly Jones Jr., told the Daily News in 2014 that keeping Bell incarcerated “would only be for revenge.”

In prison, Bell has earned bachelor’s and master’s degrees, counseled other prisoners and been a pen pal for homeless children. He has a number of offers for work, according to the parole board’s decision and his lawyer.

The decision comes about a year after a New York parole board denied release to former Weather Underground radical Judith Clark, who drove a getaway car in a bungled 1981 armored-car robbery that led to the deaths of two Nyack police officers and a security guard. Gov. Andrew Cuomo, a Democrat, had commuted Clark’s sentence to make her eligible for parole.

Associated Press writer Chris Carola contributed to this story from Albany.