Douglas Harper's Etymology Dictionary
black code
local or state legal restrictions on black persons, free or slave; attested by 1840, American English, though the thing itself is much older.
Wikipedia
Black Code
Black Code or Black Codes may refer to:
- Code Noir, or Black Code, in France
- Black Codes (United States), discriminatory state and local laws passed after the Civil War
- Black Codes (From the Underground), a 1985 album by Wynton Marsalis
- Black, a diplomatic cypher system used by the U.S. prior to its entry into the Second World War
- Sometimes Black code is synonymous for Black bag operation
- "Black code" is another name for Jim Crow laws