He was a member of an extreme right-wing terror group Organisation Consul (OC) and was one of the assassins of the German minister of foreign affairs, Walther Rathenau, on 24 June 1922.

Kern, Salomon, and Fischer were members of a terror cell of Organisation Consul for sabotage and murder, under the leadership of Karl Tillessen.

According to statements from men from the OC in Hamburg, this group was also responsible for the still unsolved murder of a Jewish merchant Sina Aronsfrau in Mannheim, who was found shot in May 1922.

On 17 July 1933 Der Stahlhelm ('The Steel Helmet, League of Front-Line Soldiers'), Hermann Ehrhardt, and members of the SA and SS unveiled a memorial plaque in the castle.

On 29 October 1933 a memorial stone was erected at the cemetery of Saaleck in the presence of Ernst Werner Techow, Heinrich Tillessen, Hanns Hustert and Ludwig Dithmar.