Answer:
Ku Klux Klan
Step-by-step explanation:
Reconstruction by white Southerners who opposed emancipation. They used threats and violence against African Americans and white Republicans to try to end Reconstruction and restore white supremacy.
Significance: The activities of the Ku Klux Klan drove Congress to pass the Force Acts, which made the use of threats, violence, or bribery to influence voters on the basis of race a federal offense.