Ferdinand Lassalle

Although Lassalle had been a member of the Communist League in 1948 his politics were strongly opposed by Karl Marx and Freindrich Engels. As a result Marxs supporters in Germany did not join the Allgemeiner Deutscher Arbeiterverein (roughly German Worker's Society) on May 23, 1863.
Lassalles ADAV was in part financially supported by monies obtained by Lassalle through his personal relations. These same relations resulted in a duel and his death.