The civil rights act of 1875, and cases combined with it, came before the supreme court in 1883 and were mostly related to

a. freedom of speech and the ku klux klan.
b. land ownership for southern sharecroppers.
c. racial discrimination in public facilities.
d. voting, poll taxes, and literacy tests

The best and only answer to your question is racial discrimination in public facilities.  

Civil Rights Act of 1875, which imposed various criminal penalties against private businesses that practiced racial discrimination. Penalties were imposed on any owner of a public establishment or conveyance who practiced racial discrimination in the conduct of his or her business.   Hope my answer would be a great help for you.