 His first criticism and doubts about Stalinism came as early as in 1936, when his mother was arrested, but his basic belief in Marxism–Leninism persisted for years.On April 16, 1948, Walter Ulbricht gave a five-hour speech at the SED college outlining the plans for the Soviet-occupied sector.He identified the SED as the future governing power and asserted that people should seek to reach their own goals through the state apparatus.