While from 1933 the corporate management was brought into line in the course of the Nazi "Gleichschaltung" process, several employees on board were organised in a clandestine trade union movement and made use of their professional activity to smuggle secret messages and material across international borders. In March 1939 the company banned German Jews and Jews without nationality from using dining or sleeping cars. In World War II the company's business was seriously limited, while on the other hand Mitropa temporarily ran former CIWL services in territories controlled by the Wehrmacht, including a restaurant at Warsaw Main Station ("Dworzec Główny") in occupied Poland. Dining car services discontinued in 1942 by order of State Secretary Albert Ganzenmüller, the last sleeping car connections were terminated in 1944.