NFL free agent Colin Kaepernick visited Alcatraz Island on Thursday to mark “Unthanksgiving Day.”

Kaepernick joined other activists for the Indigenous Peoples’ Sunrise Ceremony, a commemoration of 90 Native Americans who occupied Alcatraz for 19 months in hopes of turning the former prison into a school, according to the Sacramento Bee.

“Today, I was on Alcatraz Island at the Indigenous People’s Sunrise Gathering, in solidarity with those celebrating their culture and paying respects to those that participated in the 19 month occupation of Alcatraz in an effort to force [the U.S.] to honor the Treaty of Fort Laramie,” Kaepernick tweeted, along with a video.

Today, I was on Alcatraz Island at the Indigenous People’s Sunrise Gathering, in solidarity with those celebrating their culture and paying respects to those that participated in the 19 month occupation of Alcatraz in an effort to force to honor the Treaty of Fort Laramie. pic.twitter.com/KdNtY3dp72 — Colin Kaepernick (@Kaepernick7) November 24, 2017

“I realize that our fight is the same fight, we’re all fighting for our justice, for our freedom,” Kaepernick said at the event. “Realizing that we’re in this fight together makes us all the more powerful.”

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Kaepernick, a former quarterback for the San Francisco 49ers, made a name for himself as an activist when he began regularly taking a knee during the national anthem before games during the 2016 to protest police brutality and racial inequality.

President Trump criticized Kaepernick for his actions throughout his 2016 campaign. This season, Trump ramped up his criticisms of the league, urging NFL owners to fire players for protesting in similar ways to Kaepernick, who is not currently signed with a team.

Kaepernick was named GQ’s “Citizen of the Year” earlier this month.