Karl Heinzen figures marginally in most Karl Marx biographies because of his contacts with the founder of "scientific socialism" in the period between 1844 and 1847. A little book by C. H. Huber on Heinzen's political thought was published in Switzerland in 1932, and a full-length study in the United States by Carl Wittke who is also the author of a Weitling biography. Neither deals with the one aspect of Heinzen's thought which is, in retrospect, the most interesting by far—that of his role as the first ideologist—and great visionary—of modern terrorism. Karl Heinzen was born in Grevenbroich, Westphalia in 1809, lost his mother at an early age, and was a difficult, irascible child. He did not get along with his teachers, and was thrown out of Bonn University after a year. When Heinzen first went to the USA in 1847 he already had the reputation of one of Germany's most extreme republicans.