Freedom for Individual Rights in Education (FIRE) is an organization that defends freedom of speech for students and academics at American universities. They’ve tracked disinvitations and speech disruptions on campus over the last 17 years and recently published their findings.
From 2000-2009 disinvitations and disruptions occurred almost equally from the left and the right (on the right mostly with reference to abortion and Israel), but from 2010 onward protest veered sharply leftward. Today, over 90 per cent of speaker disinvitation attempts and speaker interruptions arise left of the speaker, occurring most frequently around racial, gender, immigration and Islam-related issues.
But even left-wingers can be disrupted or disinvited if they don’t toe the party line on every single issue sacred to progressives.