 In time, they built a network of contacts in northern Germany, in Flensburg, Kiel, Lübeck, Rostock and Bremen and even with groups outside of Germany.These connections were each overseen by a single leader to lessen the chances of the whole network being exposed to the Nazi authorities.In the middle of 1942, there was a major leaflet campaign directed at construction workers, primarily in Hamburg, who were forced to work with the Organisation Todt in Norway and the Soviet Union.