What does BLACK CODE mean?

BLACK CODE meaning in Law Dictionary

title provided collectively on human anatomy of rules, statutes, and rules in effect in various south states before 1805, which regulated the establishment of slavery, and especially those forbidding their reception at general public inns and on public conveyances. Civil-rights Instances, 109 U. S. 3, 3 Sup. Ct. 18, 27 L. Ed. 835.

BLACK CODE meaning in Etymology Dictionary

regional or state appropriate constraints on black people, no-cost or slave; attested by 1840, United states English, although the thing itself is much older.