The Supreme Court issued a ruling on Wednesday that limits the use of race in drawing voting districts, marking a shift in the interpretation of a Civil Rights-era law.

The Supreme Court dealt a blow to race-based redistricting on Wednesday, finding that Louisiana’s second black-majority congressional district was created in violation of the Constitution, but stopping short of gutting Section 2 of the Voting Rights Act.

Supreme Court rules 6-3 that Louisiana’s second majority-Black congressional district is an unconstitutional racial gerrymander.