Culture wars often begin on university campuses.

In the 1930s, book burning was common on German campuses. During the late 1940s and early 50s, McCarthyism thrived on American campuses. Today, hard-left extremism is rewarded by radical faculty and students.

Today’s campus culture wars feature attempts to censor “politically incorrect” (a term devised by Stalinist culture warriors in the 1920s and 30s) speakers — a broad category that includes conservatives, free-speech liberals, and centrist supporters of Israel. I know, because my talks have been protested at Johns Hopkins, the University of California, and Columbia. Efforts have been made to censor me — a liberal Democrat and centrist Zionist who supports the two-state solution and opposes Israel’s settlement policies.