What threats did African Americans continue to face in the South, and what measures did Congress take to deal with these threats?

The African Americans faced many threats such as the Black codes, which were laws that were passed in the south during the civil war that restricted rights of freed slaves. Some of the codes included making it illegal for African Americans to rent farms or own them. Allowing the White employers to take advantage of the African American workers. And allowing officials to arrest an fine unemployed African Americans. The congress responded with the 14th and 15th Amendment.