In the summer of 1964 thousands of white college students took part in what?

During the summer of 1964, thousands of activists in the Civil Rights Movement, many of them white college students from the North, descended on Mississippi and other Southern states to try to end the long-time political disfranchisement of African Americans in the region. Although black men won the right to vote in 1870, thanks to the 15th Amendment, for the next 100 years many were unable to exercise that right. It was called 'freedom summer'.