The U.S. Department of Education’s Office for Civil Rights announced Wednesday it has launched investigations into 18 different educational entities across 10 states based on complaints they have violated Title IX by allowing biological men in women’s spaces.

The complaints allege the various colleges and K-12 school districts “maintain policies or practices that discriminate on the basis of sex by permitting students to participate in sports based on their ‘gender identity,’ not biological sex,” a department news release stated.

“These policies jeopardize both the safety and the equal opportunities of women in educational programs and activities,” it added.

The higher education institutions on the list are Santa Monica College, Santa Rosa Junior College, and the University of Nevada, Reno. The Hawaii State Department of Education is also on the list, and the rest are school districts scattered across the nation.

“In the same week that the Supreme Court hears oral arguments on the future of Title IX, OCR is aggressively pursuing allegations of discrimination against women and girls by entities which reportedly allow males to compete in women’s sports. Time and again, the Trump Administration has made its position clear: violations of women’s rights, dignity, and fairness are unacceptable,” Assistant Secretary for Civil Rights Kimberly Richey stated in the news release.

“We will leave no stone unturned in these investigations to uphold women’s right to equal access in education programs—a fight that started over half a century ago and is far from finished,” Richey stated.

MORE: ‘There’s a harm there’: Supreme Court appears to side with bans on men in women’s sports