In the summer of 1964 three white civil rights activists were murdered in Mississippi. They were helping black voters to enroll on the official voting register. Which organization was found to be responsible for the deaths?

During the 1960s, under the leadership of Martin Luther King and others, African Americans began their struggle for civil rights. They demanded an end to racial discrimination of all kinds in the USA. Much was achieved in the 1960s, despite differences within the coalition - and King's assassination in 1968.