The relatively unknown public response to Vladimir Lenin's famous pamphlet "Ultra Left Communism: An Infantile Disorder." Herman Gorter (1864 - 1927) was a Dutch poet and socialist. He was a leading member of the Tachtigers, a highly influential group of Dutch writers who worked together in Amsterdam in the 1880s, centered around De Nieuwe Gids (The New Guide). Gorter shared in common with the Tachtigers an interest in leftist politics, and became the most politically involved of the group, becoming an active writer on socialist theory. He joined the Social Democratic Labour Party (Sociaal-Democratische Arbeiderspartij or SDAP) in 1897. In 1909 he participated in a schism from the SDAP to form the Social-Democratic Party (Sociaal-Democratische Partij) of the Netherlands. He wrote a massive new epic poem called Pan in 1912, describing the First World War being followed by a global Socialist revolution. In 1917, he hailed the Russian revolution as the beginning of that global revolution, although he soon afterward came to oppose Lenin. In 1918 the Social-Democratic Party changed its name to the Communist Party of Holland (Communistische Partij Holland), and in 1919 Gorter left the party. In 1921 he was a founding member of the Communist Workers Party of Germany, joining its Essen Faction and becoming a leading supporter of the Communist Workers International. Gorter died in Brussels in 1927.