William S. (Willi) Schlamm (originally: Wilhelm Siegmund Schlamm; June 10, 1904 – September 1, 1978) was an Austrian-American journalist.
Born in Przemyśl, Galicia, then part of the Austrian Empire, the son of a wealthy Jewish merchant, he became a Communist, being received when he was 16 years old by Vladimir Lenin in the Kremlin, After completing his Abitur (high school examinations), he became a writer with the Vienna Communist newspaper, Die Rote Fahne. Breaking with the Communist Party in 1929, he joined the editorial staff of the left-wing magazine Die Weltbühne in 1932.
Schlamm encouraged William F. Buckley, Jr. to found the conservative magazine, National Review, with Buckley as the sole owner. Schlamm became a senior editor but was later fired by Buckley. He then became associate editor of the John Birch Society's journal, American Opinion. After writing for conservative magazines, he returned to Europe in 1972, where he published the magazine Die Zeitbühne. He died in 1978 in Salzburg
Schlamm is remembered for having coined the saying, "The trouble with socialism is socialism. The trouble with capitalism is capitalists."
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