Fans that unfurled a sign inscribed with the message "Racism Is As American As Baseball" on Fenway Park's Green Monster Wednesday were escorted from the park by security officers.
The sign was up for one batter before umpires ordered it removed because it was in fair territory.
According to media reports, one of the four sign holders that was ejected said it was inspired by the Black Lives Matter movement.
Red Sox RF Mookie Betts said, "Yeah, I saw it. There's no place for that. That's for another day, thought."