Seitz, Karl (kärl zĪts) [key], 1869–1950, Austrian politician. He was a deputy from 1901 and became (1907), with Viktor Adler, co-leader of the socialist group in parliament. He was (1919–20) acting president of Austria. As mayor of Vienna (1923–34) he increased social services. When the Social Democrats were suppressed in 1934, he was arrested but was later released on parole. He was imprisoned by the Nazis in 1944. When Austria was restored after World War II, Seitz was elected (1945) to parliament.
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