From the Foundation for Individual Rights in Education (FIRE):

“Scholars Under Fire: 2021 Year in Review” documents last year’s attempts to penalize scholars for speech and research that, even when controversial, is protected by the First Amendment. FIRE documented 111 attempts to target scholars for their speech in 2021, all of which have been added to FIRE’s Scholars Under Fire Database. This reflects a dramatic increase from 30 attacks against scholars in 2015.

“Even one attack on free speech is one too many,” said FIRE Research Fellow Komi German, one of the report’s authors. “Our colleges should be built on the foundation that differences of opinion should give rise to debate and discussion — not sanctions and firings. If you asked someone which country had 111 scholars targeted in 2021, they might guess an authoritarian regime like China or Russia, not a democratic nation like the United States.”

Here is the executive summary.