Final answer:
The Ku Klux Klan in the 1860s and 1870s targeted African Americans and their white supporters. The Enforcement Acts helped put an end to the Klan's activities.
Step-by-step explanation:
The Ku Klux Klan (KKK) in the 1860s and 1870s targeted African Americans and their white supporters. They engaged in a campaign of intimidation, violence, and murder to suppress equal rights and maintain white supremacy in the South.
The government act that helped put an end to the Ku Klux Klan's activities was the Enforcement Acts, passed between 1870 and 1871. These acts criminalized the deprivation of civil rights of African Americans and allowed for the use of U.S. troops to protect freedpeople.