Fletcher v. Lamone was the first case to go all the way to the U.S. Supreme Court that challenged a state law that ended prison-based gerrymandering. On June 25, 2012, the Supreme Court summarily affirmed a lower court's ruling, upholding Maryland's first-in-the-nation law requiring incarcerated people to be counted as residents of their home addresses for redistricting purposes. The law's passage in 2010 was a major civil rights victory.
https://www.prisonersofthecensus.org/fletcher/