Nov. 24 was the 100th anniversary of William F. Buckley Jr.’s birth. Even though he has been gone for more than a decade and a half, the impact of his life is still being felt today. In his efforts to forge a consequential movement, Buckley worked to “police the Right,” expelling antisemites and conspiracy theorists from the movement he created. It was a role he maintained throughout his six decades in politics. The centenary of his birth makes this a worthwhile time to remember why this was important in the past — and why it isn’t happening now.