Today in history: On June 30, 1934, Adolf Hitler launched his “blood purge” of political and military rivals in Germany in what came to be known as the “Night of the Long Knives.” Also on this date: In 1918, labor activist and socialist Eugene V. Debs was arrested in Cleveland, charged under the Espionage Act of 1917 for a speech he had made two weeks earlier in which he denounced U.S. involvement in World War I. (Debs was sentenced to prison and disenfranchised for life.) In 1921, President