What were some black codes?

Race was defined by blood; the presence of any amount of black blood made one black.
Employment was required of all freedmen; violators faced vagrancy charges.
Freedmen could not assemble without the presence of a white person.
Freedmen were assumed to be agricultural workers and their duties and hours were tightly regulated.
Freedmen were not to be taught to read or write.
Public facilities were segregated.
Violators of these laws were subject to being whipped or branded.