In the radical left-wing Demokrat magazine, which he co-edited with Georg Zepler (1859–1925), he published texts by numerous writers who would later become contributors to Die Aktion.
Pfemfert decided to publish only those contributions that were purely literary in nature, in order to avoid a complete ban of the magazine.
He succeeded against the odds, as Die Aktion never actually stopped the flow of anti-war messages (including virulent articles that had already been featured in other magazines, such as "I Cut Time", and a column of letters to the editor which allowed sharp criticism of artists and intellectuals who were supporting the war).
Pfemfert also continued to publish literary articles with veiled antimilitaristic themes, such as poems from the front (including works by Oskar Kanehl and Wilhelm Klemm, who painted a stark picture of trench warfare).
[3] Declaring himself disappointed with Expressionism, Pfemfert abandoned his advocacy of the movement (arguing that many writers had become too saturated, and that they only were interested in contracts with large publishing houses — which he understood as a betrayal).
He felt that the once rebellious phase of expressionism was finally over, and, in reaction, he only published political texts in Die Aktion.
When the KPD changed its policies in October 1919, and began to exclude Syndicalists, Pfemfert tried once again to align Die Aktion with the Left Communist opposition.
Early on, these were printed on the title page, before it was changed to a cover that often featured an Expressionist artwork alongside the magazine's contents.
To attract more revenue, a luxury edition was printed on deckle edged paper with a circulation of 100 copies, and sold at four-times the usual price.
This came about as Pfemfert wanted to remain independent, printing no advertisements, but also to regularly attend events such as balls, readings and lecture evenings.
From 1918 to 1929, the poet Oskar Kanehl was Pfemfert's most important collaborator, and Alexandra Ramm-Pfemfert regularly participated in working on the magazine.