What were the Freedom Riders protesting?

Freedom Riders were groups of white and African American civil rights activists who participated in Freedom Rides, bus trips through the American South in 1961 to protest segregated bus terminals. Freedom Riders tried to use “whites-only” restrooms and lunch counters at bus stations in Alabama, South Carolina and other Southern states.

Explanation:

the communist manifesto is an 1848 political pamphlet by the german near the end of the manifesto, the authors call for a "forcible overthrow of all existing social conditions",  ..

the of atp are the key to its ability to store and supply energy;

phosphate

the phosphate groups of atp are the key to its ability to store and supply energy. atp releases energy when it breaks bonds between its phosphate groups.