MINNEAPOLIS (AP) — Hundreds of activists and Indigenous leaders rallied outside the White House on Tuesday in support of Leonard Peltier on the imprisoned activist’s 79th birthday, holding signs and chanting slogans urging President Joe Biden to grant clemency to the Native American leader.

Peltier is serving life in prison for the killing of two FBI agents during a 1975 standoff on the Pine Ridge Indian Reservation in South Dakota. He was convicted in 1977.

Key figures involved in Peltier’s prosecution have stepped forward over the years to urge his release, rally organizers said, including the judge who presided over Peltier’s 1986 appeal and the former U.S. attorney whose office handled the prosecution and appeal of Peltier’s case.

The rally kicked off Tuesday with chanting and drum beats. Organizers delivered impassioned speeches about Peltier’s life and his importance as a Native leader, punctuated by shouts of “Free Peltier! Free Peltier!”

“Forty-eight years is long enough,” said Nick Tilsen, president of NDN Collective, an Indigenous-led advocacy group that co-organized the rally with Amnesty International USA.

“We are calling on the Biden administration, who has made it a choice — has made Indigenous civil rights a priority — for his administration, yet he allows and continues to allow the longest incarcerated political prisoner in the United States,” Tilsen said at the rally.

Amnesty International considers Peltier a political prisoner, and organizers said a United Nations working group on arbitrary detention specifically noted the anti-Indigenous bias surrounding Peltier’s detention.

Over 100 people have journeyed by bus and caravan for three days from South Dakota to the District of Columbia this week in support of Peltier’s release, NDN Collective said in a Facebook post. Expected speakers include “Reservation Dogs” actor Dallas Goldtooth, U.S. Rep. Raul Grijalva of Arizona, the president of the National Congress of American Indians and other Indigenous leaders.

While Peltier’s supporters argue that he was wrongly convicted in the killings of FBI agents Jack Coler and Ronald Williams, the agency has maintained over the years that he is guilty and was properly sentenced to two consecutive life terms.

“Peltier intentionally and mercilessly murdered these two young men and has never expressed remorse for his ruthless actions,” the FBI said in an email Monday, adding that Peltier’s conviction “has withstood numerous appeals to multiple courts, including the U.S. Supreme Court.”

Peltier has exhausted his opportunities for appeal and his parole requests have been denied. He is incarcerated at a federal prison in Coleman, Florida.

An enrolled member of the Turtle Mountain Chippewa tribe, Peltier was active in the American Indian Movement, or AIM, which grabbed headlines in 1973 when it took over the village of Wounded Knee on the reservation, leading to a 71-day standoff with federal agents.

Tensions between AIM and the government remained high for years, providing the backdrop for the fatal confrontation in which both agents were shot in the head at close range.

U.S. Interior Secretary Deb Haaland, the first Native American to lead a Cabinet department, said while she was a congresswoman that she supports Peltier being released.

“Congress hasn’t weighed in on this issue in years,” Haaland posted on social media in 2020, citing concerns about COVID-19. “At 75 with chronic health issues, it is urgent that we #FreeLeonardPeltier.”

In 2017, then-President Barack Obama denied a clemency request by Peltier.

According to Peltier’s attorney at the time, Martin Garbus, they received a letter from the White House saying their application to commute his sentence to the 40 years he already served was denied.

AIM began as a local organization in Minneapolis that sought to grapple with issues of police brutality and discrimination against Native Americans in the 1960s. It quickly became a national force.

The group called out instances of cultural appropriation, provided job training, sought to improve housing and education for Indigenous people, provided legal assistance, spotlighted environmental injustice and questioned government policies that were seen as anti-Indigenous. At times, AIM’s tactics were militant, which led to splintering in the group.

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Trisha Ahmed is a corps member for the Associated Press/Report for America Statehouse News Initiative. Report for America is a nonprofit national service program that places journalists in local newsrooms to report on under-covered issues. Follow her on X, formerly known as Twitter: @TrishaAhmed15