Alabama state troopers wear gas masks as tear gas is fired on marchers in 1965. Fifty years ago, about 600 people began a 50-mile march from Selma, Alabama, to the state capital of Montgomery so that they could protest discriminatory practices that prevented black people from voting. But as the marchers descended to the foot of the Edmund Pettus Bridge, state troopers used brutal force and tear gas to push them back. It is now known as "Bloody Sunday."
Sheriff's deputies in Selma prepare to confront marchers on "Bloody Sunday."
Singer Harry Belafonte, right, was among the activists at the Selma to Montgomery marches.
State police form a barricade as they wait for marchers on "Bloody Sunday."
Pam Clemson rushes to the aid of a fellow demonstrator who was felled by a blow to the head in Selma.
Belafonte, left, and Joan Baez entertained activists with music before the march.
Harriet Richardson, a student activist, presses a cloth to the wounds of bloodied poet Galway Kinnell in Selma.