One of the most consequential flashpoints in memory was when a trio of voting rights marches were staged in Selma, Alabama in 1965. Launched by locals with the help of the Student Nonviolent Coordinating Committee, the first demonstration came to be known as Bloody Sunday because of the way the police viciously attacked the 500+ participants with teargas and billy clubs, all at the direction of a racist Sheriff named Jim Clark (Stan Houston).
Fallout from the shocking media coverage garnered the attention of Dr. Martin Luther King, Jr. (David Oyelowo) who agreed to get involved. And after an aborted second attempt to cross the Edmund Pettus Bridge, the controversy blossomed into a nationwide cause célèbre with 25,000 people willing to risk their life and limb descending upon tiny Selma, including cultural icons like Harry Belafonte, Nina Simone, Joan Baez, Sammy Davis, Jr. and Peter, Paul and Mary.