PHILADELPHIA (CBS) — Some Philadelphia activists are calling for a boycott of this Sunday’s NFL games.

Their call to action comes days after former quarterback Colin Kaepernick filed a grievance that accuses NFL owners of colluding to keep him out of the league.

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Members of the #10/22 committee made the boycott announcement outside Philadelphia’s City Hall Monday morning.

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Organizers say they stand in support of Kaepernick and other NFL players who protested social injustice by kneeling during the national anthem.

“We decided to call for a coordinated national effort, so on the Sunday games of Oct. 22, 2017, we ask for all freedom-loving and justice-loving citizens of the United States to turn off the NFL,” said Supreme Dow.

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The group also called on the public to show their support for the First Amendment this Sunday by protesting outside of NFL stadiums nationwide.