This populist form of economic antisemitism was further developed in 1925 when Otto Strasser published the "Nationalsozialistische Briefe" which discussed notions of class conflict, wealth redistribution and a possible alliance with the Soviet Union. His 1930 follow-up "Ministersessel oder Revolution" ("Cabinet Seat or Revolution") went further by attacking Hitler's betrayal of the socialist aspect of Nazism as well as criticizing the notion of the "Führerprinzip". Whilst Gregor Strasser echoed many of the calls of his brother, his influence on the ideology is less, owing to his remaining in the Nazi Party longer and to his early death. Meanwhile, Otto Strasser continued to expand his argument, calling for the break-up of large estates and the development of something akin to a guild system and the related establishment of a "Reich" cooperative chamber to take a leading role in economic planning.