The fourth one is actually from the 1988 movie Colors. Got any context on the second one?
Demonstrators line up in the city’s courtyard in Selma, Alabama. March 19, 1965, part of the Selma to Montgomery marchs.
Alabama State troopers attack protestors on the Edmund Pettus bridge in Selma, Alabama, on March 7, 1965.
Alabama Highway Patrol at Viola Liuzzo's civil rights activist crime scene.