FILE - In this March 7, 1965 file photo, state troopers use clubs against participants of a civil rights voting march in Selma, Ala. At foreground right, John Lewis, chairman of the Student Nonviolent Coordinating Committee, is beaten by a state trooper. The day, which became known as "Bloody Sunday," is widely credited for galvanizing the nation's leaders and ultimately yielded passage of the Voting Rights Act of 1965. (AP Photo/File)

PHOTOS: Selma – 50 Years Later

Saturday, March 7th, marks the 50th anniversary of the civil rights milestone known as “Bloody Sunday”. That event is widely credited for ga…