Adopted name of Karl Herbert Frahm 1913- . West German socialist politician, federal chancellor (premier) 1969-74. He played a key role in the remoulding of the Social Democratic Party (SPD) as a moderate socialist force (leader 1964-87). As mayor of West Berlin 1957-66, Brandt became internationally known during the Berlin Wall crisis 1961. He received the Nobel Peace Prize 1971. Brandt, born in Lubeck, changed his name when he fled to Norway 1933 and became active in the anti-Nazi resistance. He returned 1945 and entered the Bundestag (federal parliament) 1949. In the `grand coalition' 1966-69 he served as foreign minister and introduced Ostpolitik, a policy of reconciliation between East and West Europe, which was continued when he became federal chancellor 1969, and culminated in the 1972 signing of the Basic Treaty with East Germany. He resigned from the chancellorship 1974 following the discovery that a close aide, Gunther Guillaume, had been an East German spy. Brandt continued to wield considerable influence in the SPD, in particular over the party's new radical left wing. He chaired the Brandt Commission on Third World problems 1977-83 and was a member of the European Parliament 1979-83.