War ended in May 1945, and with it the one-party Hitler dictatorship. Raddatz re-joined the re-emerging SPD in June 1945 and was appointed to lead the social affairs department for Berlin-Neukölln. The western two thirds of Germany were now divided into four military zones of occupation. For Berlin, set in the middle of the Soviet occupation zone, separate arrangements had been agreed between the allied leaders, although many practical decisions over how the city would be administered had been left ambiguous, reflecting the inability of the so-called "Big Three" to agree the details between themselves. Berlin was divided into , each under the military administration of one or other of the victorious powers. Neukölln was in the , and in November 1945 the American military administration confirmed Raddatz in his post as "Bezirksstadtrat" (loosely, "District city councillor") for social affairs. He would continue to hold the job through a succession of political reconfigurations, till his retirement in January 1959.