Dutch resistance developed slowly. In 1941, Dutch people organized a strike, called the February strike, to protest against the Nazis deporting over 400 Jews. This encouraged the resistance. The Dutch communists set up a system of cells (small groups of resistance members). Some other very amateur groups also formed, like De Geuzen, set up by Bernard IJzerdraat. Some military groups started, such as the Ordedienst ('order service'). Most groups were discovered by the Nazis during the first two years of the war.