The U.S. Department of Justice on Thursday launched investigations into Stanford University and three University of California schools to ensure they comply with a U.S. Supreme Court ruling that struck down race-conscious admissions.

The schools may be in violation of a landmark Supreme Court ruling banning colleges and universities from using race-based admissions criteria.

The latest action comes after the U.S. Department of Education said it was investigating 52 universities for alleged racial discrimination earlier this month.