The U.S. Supreme Court on Monday declined to hear a case on college programs which a conservative group claimed chills free speech and pushes students to be fearful to express an unpopular or controversial viewpoint.

The Supreme Court is turning back a challenge from conservative college students who say their freedom of speech is violated by a university program for reporting allegations of bias.

The Supreme Court on Monday declined to hear a challenge to Indiana University’s use of a “bias response team,” prompting a dissent from Justice Clarence Thomas, who argued the case was an important opportunity to resolve a split among federal courts over whether such programs infringe on student free speech rights.