Knut Peder Langfeldt (14 January 1925 – 24 October 2018) was a Norwegian organizational worker and political science writer.
He also joined the Young Communist League of Norway, and came in contact with Peder Furubotn.
Furubotn arranged the drafting of Langfeldt into the Parteihochschule Karl Marx in what would become East Berlin, and here he was a contact between the Communist Party of Norway (who knew him only by the pseudonym Karl Quandt) and the German socialist party (who knew him as Kurt Lindenberg).
[4] In 1962 he, together with Jacques Freymond, Henri Burgelin and Miklós Molnár, co-published the 800-page work La Première Internationale on the First International.
[5] In the Norwegian language he published the books Moskvatesene i norsk politikk in 1961 and Det direkte demokrati: Rådsrepublikk eller parlamentarisme?