Attendees raise their fists while participating in the March on Washington at the Lincoln Memorial Aug. 28, 2020 in Washington, D.C. (Photo by Drew Angerer/Getty Images) WASHINGTON - Capping a week of protests and outrage over the police shooting of a Black man in Wisconsin, civil rights advocates began highlighting the scourge of police and vigilante violence against Black Americans at a commemoration of the 1963 March on Washington for Jobs and Freedom.An estimated thousands have gathered Friday near the steps of the Lincoln Memorial, where the Rev.