Ernest Riebe immigrated to the United States from his native Germany sometime around the turn of the 20th century. He became an illustrator and cartoonist for the IWW in the 1910's. His most famous creation was the long running series featuring Mr Block a caricature of a Conservative working man detailing his life and prejudices. Here are a few other images he created.
An article in the International Socialist Review from October 1917 about the federal raids on the Socialist Party and the Industrial Workers of the World the month before.
Mr. Block, who has no first name, was created November 7, 1912 by Ernest Riebe, a member of the Industrial Workers of the World (IWW). Block appeared that day in the Spokane newspaper Industrial Worker, smoking a cigar and wearing a checkered suit with top hat. Subsequently, Mr. Block lost the fancy clothes but often kept a hat, ten sizes too small, perched on one corner of his wooden blockhead.
Direct Action was published by the Industrial Workers of the World Australian Administration.
It printed 135 issues between January 1914 and August 1917. Twelve more issues were published between May 1928 and May 1929 and another two in November 1930. A history of the paper can be found here.