Final answer:
White supremacists in Mississippi responded violently to white students from the North who were helping African Americans register to vote during the Freedom Summer.
Step-by-step explanation:
During the Freedom Summer in Mississippi, white supremacists responded violently to white students from the North who traveled down South to help African Americans register to vote. Many of these student volunteers faced harassment, beatings, and arrests, while African American homes and churches were burned. Three civil rights workers were killed by the Ku Klux Klan with the help of the police.