In the 1930s, State Security was occupied dealing by left- and right-wing extremis, and a surge in German espionage activity. The German threat caused the Belgian government to reinstate the military intelligence service in 1937. As war became imminent, the two services were briefly brought together under the same ministry. After the German invasion, Belgian intelligence followed the government in exile to London to undertake the coordination of the resistance once again. This was impeded by the rift between the government and King Leopold III, who had decided to stay in Belgium and thus fall into the hands of the Nazis. The government, unwilling to trust the military intelligence service because of their loyalty to their commander-in-chief made prisoner of war, favoured the State Security. This greatly exacerbated the rivalry between the two services, whose mutual animosity forced the government to appoint a High Commissioner to coordinate their actions.