Ryan Coogler, who directed the 2013 film about police brutality called “Fruitvale Station,” told us he was confounded by the eruptions of “human rights violations committed by public servants.”

“There are three ways you can express yourself,” Coogler said. “You can vote. You can protest. You can choose how you spend your money that goes to America’s corporations that hold a lot of power.”

“We’ve got to fight the powers that be!” proclaimed Public Enemy’s Chuck D in 1989. With the embers of Ferguson still smoldering, it is clear that the struggle continues. But by taking their purchasing power away on retailers’ favorite day of the year, the voice of blacks in America, and their allies, may echo more loudly in its absence from shopping malls and big box stores.