 Complete the following phrase:  From 3 October 1957 to 1966, Willy Brandt served as Governing Mayor of West Berlin, during a period of increasing tension in East-West relations that led to the construction of the Berlin Wall. In Brandts first year as mayor of Berlin, he also served as the president of the Bundesrat in Bonn. Brandt was an outspoken critic of Soviet repression of the 1956 