Eugene "bull" connor, the commissioner of public safety in birmingham in the 1960s,

arrested members of the ku klux klan.

o bailed martin luther king jr. out of jail.

o protected protesters from white resisters.

led a violent crackdown on civil rights protests.

Led a violent crackdown on civil rights protests is the correct answer.

Explanation:

Eugene Bull Connor was American politician and served as the commissioner of public safety for the  city of Birmingham, Alabama. He was against the activities of American civil rights movement in 1960's. Under the city government he was giver the charge of Police department and Fire department. He denied the civil rights to he black citizens and enforced racial segregation. He is known as the symbol of institutional racism. He use attack dogs, fire hoses against the civil rights protesters during the southern Christian Leadership Conference's  Birmingham Campaign in 1963.

this isn't a question and if you're going to list things be kind and use commas.