LEARNING FROM HISTORY: How to Defend Free Speech. The 1980s and 1990s battles against campus political correctness offer lessons for pushing back against cancel culture today. While cancel culture is indeed broader and more worrisome than campus PC was, Tevi Troy writes, the earlier effort was successful in four major ways: by unifying conservatives in the effort against PC; by enlisting some prominent non-conservatives to join the cause; by gaining broad attention outside the think tank and university world; and by using humor to highlight PC’s excesses.  All of these tactics could be useful in the anti-cancel culture fight of today.