MISSION, Kan. (AP) — The roughly 17,000 fans of the Kansas City Chiefs who filed into Arrowhead Stadium for a masked and socially distanced start to the NFL season Thursday were prohibited from wearing headdresses or war paint amid a nationwide push for racial justice following the police-custody death of George Floyd in Minneapolis.

The move by the reigning Super Bowl champions has been received by Native Americans as a good first step, but it also frustrated some of the franchise's longtime fans, including some who were in the stands as the team became the first to take the field in front of...