Die deutsche Ideologie
At first a supporter of "true socialism", Weydemeyer became in 1845–1846 a follower of Karl Marx and Friedrich Engels and a member of the League of Communists, heading its Frankfurt chapter from 1849 to 1851. He visited Marx in Brussels, staying there for a time to attend Marx's lectures. He participated in the 1848 Revolution. He was one of the "responsible editors" of the "Neue Rheinische Zeitung" from 1849 to 1850. He acted on Marx's behalf in the failed publication of the manuscript of "The German Ideology".