Vienna’s Café Central was crowded with intellectuals at the turn of the 20th century, including Freud, Lenin, the Vienna Circle of logical positivists, and endless chessplayers.

When Victor Adler made the argument that war would provoke a revolution in Russia, Leopold Berchtold replied, “And who will lead this revolution? Perhaps Mr. Bronstein sitting over there at the Café Central?”

Mr. Bronstein was Leon Trotsky.