[3] Anarchist sympathies began to grow among a few select individuals in Denmark, some of whom were responsible for translating the works of Peter Kropotkin into the Danish language.
By the time of World War I, anarchism and syndicalism played a key role in the Danish labor movement and the struggle for the conditions of the unemployed.
The syndicalist weekly periodical Arbejdet was established, which Christensen, Carl Heinrich Petersen and Halfdan Rasmussen participated in, but the newspaper ceased publication in 1938.
During the Nazi occupation of Denmark in World War II, syndicalists such as Petersen and Rasmussen participated in the Danish resistance movement, clandestinely publishing anti-fascist propaganda and forming insurgent groups to commit acts of sabotage.
The most significant act of which was the establishment of Freetown Christiania in an abandoned army barracks of Copenhagen in 1971, beginning an anarchist project to create a self-governing society.