NEW YORK — Former San Francisco 49ers quarterback Colin Kaepernick filed a grievance against the NFL on Sunday, alleging that he remains unsigned as a result of collusion by owners following his protests during the national anthem.

Kaepernick started a national conversation about political activism by athletes last season when he decided to sit, and then kneel, during the anthem to bring attention to mistreatment of African-Americans by police. Other players have continued the protests this season, prompting an angry response from President Donald Trump, who said players should be fired for not standing during the anthem.

Kaepernick opted out of his contract with the 49ers at the end of last season and remains a free agent despite a rash of injuries and poor play at the quarterback position.

Mark Geragos, one of Kaepernick's attorneys, said in a statement posted on Twitter on Sunday that he filed the grievance "only after pursuing every possible avenue with all NFL teams and their executives."

"If the NFL (as well as all professional sports leagues) is to remain a meritocracy, then principled and peaceful political protest — which the owners themselves made great theater imitating weeks ago — should not be punished," Geragos said in the statement, "and athletes should not be denied employment based on partisan political provocation by the executive branch of our government. Such a precedent threatens all patriotic Americans and harkens back to our darkest days as a nation."

San Francisco safety Eric Reid, Kaepernick's former teammate, has been kneeling during the anthem before games, including Sunday's 26-24 loss at the Washington Redskins.

"I'll have to follow up with him," Reid said after the game. "It sure does seem like he's being blackballed. I think all the stats prove that he's an NFL-worthy quarterback. So that's his choice and I support his decision. We'll just have to see what comes of it."

The NFL players' union said it would support the grievance, which was filed through the arbitration system that's part of the league's collective bargaining agreement.

"Colin Kaepernick's goal has always been, and remains, to simply be treated fairly by the league he performed at the highest level for and to return to the football playing field," Geragos said.

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ALL-EMPIRE GIRLS WRESTLING

ALL-EMPIRE GIRLS WRESTLING

WRESTLER OF THE YEAR

Victoria Espinoza, Sr., Rancho Cotate

(235 pound weight class)

FIRST TEAM

101: Krystal Lockwood, Jr., Lower Lake

106: Adriana Lopez, Fr., Upper Lake

111: Felicity Bernardo, Fr., Casa Grande

116: Abebrean Gonzales, Soph., Lower Lake

121: Brigitte Mihalca, Soph., Casa Grande

126: Kim Juarez, Jr., Analy

131: Nicole Karkar, Soph., Willits

137: Dana Johnson, Jr., Santa Rosa

143: Kayla Harrison, Fr., Ukiah

150: Mari Mendoza, Fr., Analy

160: Alexus Tavares, Sr., Piner

170: Kenya Henderson, Sr., Ukiah

189: Gabby Agenbroad, Sr., Willits

235: Michelle Larsen, Sr., Petaluma

SECOND TEAM

101: Cindy Diaz, Soph., Petaluma

106: Samantha Hayman, Sr., Windsor

111: Citalalie Calderon, Soph., Petaluma

116: Alyssa Archer, Soph., Petaluma

121: Christin Wilson, Soph., Upper Lake

126: Selina Medrano, Sr., Casa Grande

131: Mikelynn Row, Fr., Lower Lake

137: Charlene Sanza, Jr., Rancho Cotate

143: Sarah Cook, Fr., Petaluma

150: Azucena Montesinos, Jr., Windsor

160: Raquel Mancilla, Soph., Rancho Cotate

170: Emma Desvaux, Soph., Rancho Cotate

189: Jasmin Clarke, Fr., Kelseyville

235: Kimberly Carrillo, Sr., Windsor

COACH OF THE YEAR

Shane Roberts, Ukiah