This article originally appeared at The Washington Post:

Today is May Day. Since 2007, I have defended the idea of using this date as an international Victims of Communism Day. I outlined the rationale for this proposal (which is not my original idea) in my very first post on the subject:

May Day began as a holiday for socialists and labor union activists, not just communists. But over time, the date was taken over by the Soviet Union and other communist regimes and used as a propaganda tool to prop up their regimes. I suggest that we instead use it as a day to commemorate those regimes’ millions of victims. The authoritative Black Book of Communism estimates the total at 80 to 100 million dead, greater than that caused by all other twentieth century tyrannies combined. We appropriately have a Holocaust Memorial Day. It is equally appropriate to commemorate the victims of the twentieth century’s other great totalitarian tyranny. And May Day is the most fitting day to do so….

The main alternative to May 1 is November 7, the anniversary of the communist coup in Russia. However, choosing that date might be interpreted as focusing exclusively on the Soviet Union, while ignoring the equally horrendous communist mass murders in China, Cambodia, and elsewhere. So May 1 is the best choice.