The Radical Republicans took control of Reconstruction after Lincoln's assassination. They established the Freedmen's Bureau to help former slaves and passed the 13th, 14th, and 15th Amendments. However, white supremacist groups like the KKK used violence and intimidation. Rufus Bullock became governor of Georgia but unrest continued until military rule was restored. The Compromise of 1877 ended Reconstruction, leaving the South under Democratic control.