What were the groups that were formed during the Reconstruction?

During Reconstruction, several groups emerged, notably the Freedmen's Bureau, which aimed to assist formerly enslaved people in transitioning to freedom. The Ku Klux Klan (KKK) also formed during this period, promoting white supremacy and violence against African Americans and their allies. Additionally, various political factions, such as the Radical Republicans, sought to implement civil rights reforms and ensure African Americans' participation in politics. These groups significantly influenced the social and political landscape of the post-Civil War South.