Freedom Summer, also known as the Mississippi Summer Project, was a voting rights campaign that took place in Mississippi during the summer of 1964. Organized by civil rights organizations such as the Congress of Racial Equality (CORE) and the Student Nonviolent Coordinating Committee (SNCC), Freedom Summer aimed to register as many African Americans as possible to vote in the state, where voter suppression and intimidation were rampant.

Over 1,000 mostly white volunteers from across the United States joined local activists in Mississippi to help with voter registration, education, and advocacy. The volunteers faced significant opposition, including violence and harassment from white supremacists and law enforcement.

The efforts of Freedom Summer helped bring national attention to the ongoing struggle for civil rights and voting rights in the South. The volunteers' work paved the way for the passage of the Voting Rights Act of 1965, which prohibited racial discrimination in voting and protected the voting rights of African Americans.

Freedom Summer marked a pivotal moment in the civil rights movement, demonstrating the power of interracial cooperation and grassroots organizing in the fight for racial equality and social justice.