It was once said that every generation must learn anti-communism for itself, and much the same is true of antisemitism.... I was particularly struck by this when I was invited, in 2013, to be one of six keynote speakers at a ceremony at Mauthausen, the infamous Nazi concentration camp in Austria, where my cousin, Mila Racine, was killed in the last weeks of the war. The four speakers who preceded me — the presidents of Austria, Hungary, and Poland, and the speaker of the Russian parliament — all invoked painful images of the war and the massive loss of Jewish life. They made moving statements affirming their commitment to remembrance and their opposition to any resurgence of hatred against Jews.