The rules agreed between the occupying powers concerning
Berlin itself conferred on the city a special status which differentiated the Soviet sector of Berlin from the
Soviet occupation zone of Germany which on three of its four sides adjoined it. The
SPD used this fact to run a party referendum on the merger, using a secret ballot, across the whole of Berlin. The referendum was suppressed in the Soviet sector on 31 March 1946, but it went ahead in those parts of the city controlled by the other three occupying powers, and resulted in rejection of the merger proposal from 82% of the votes cast by participating SPD members. The merger of the KPD and SPD to form the SED only affected the Soviet sector of the city. It was not till the end of May 1946 that the four
Allies reached agreement: the western allies permitted the
SED in the western sectors, and in return the
Soviet Military Administration in Germany agreed to allow the SPD back into the eastern sector of Berlin. That did not mean, however, that the SPD was able to operate unhindered as a political party in East Berlin. Following the
City council elections for Greater Berlin which took place on 20 October 1946, in which the SED and SPD both competed, the total turnout was high at 92.3%. Across the city, the SPD won 48.7% of the vote while the SED won 19.8%. Of the other principal participants the
CDU (party) won 22.2% and the
LDP 9.3%. As matters turned out, this was the only free election to take place across the entirety of Berlin until after
1990. Following the 1946 city council election the
Soviet Military Administration and the
SED in effect divided the city. In 1947 the Soviet city commander vetoed from the election of
Ernst Reuter as the
city's governing mayor. This was followed up by the blowing up of the City Council Building by "the masses" and the withdrawal of the Soviet city commander from the
Allied Kommandatura in 1948, which turned out to be a prelude to the
Soviet Union's
Blockade of West Berlin. The SPD did indeed continue to exist in the eastern sector, but the basis for its existence changed fundamentally, since it was banned from public activity and its participation in elections was blocked by the
National Front of the
Democratic Republic of Germany, a political alliance created to enable minor political parties to be controlled by the
SED. Some individual SPD members nevertheless continued to be politically active. Most notably, , the regional SPD chairman in
Berlin-Friedrichshain was elected to the
West German Bundestag where he sat from 1 February 1952 till 16 April 1963, for much of the time as the only member of the chamber with a home address inside the
Soviet occupation zone. It was only in August 1961, a few days after the
Berlin Wall was erected, that the party closed his office in East Berlin, but without giving up its claim to it. ==The example of Thuringia==