Legal fights over the use of census data brought protesters to the Supreme Court in 2019.

WASHINGTON, DC – MARCH 26: A Fair Maps Rally was held in front of the U.S. Supreme Court on Tuesday, March 26, 2019 in Washington, DC. The rally coincides with the U.S. Supreme Court hearings in landmark redistricting cases out of North Carolina and Maryland. The activists sent the message the the Court should declare gerrymandering unconstitutional now. (Photo by Sarah L. Voisin/The Washington Post via Getty Images)