In August 1946 he was promoted to major general. From 1946 to 1947, Alexiu was the inspector of artillery. He became commanding 2nd Military Region in 1947 and general officer commanding anti-aircraft defence in 1949. In a secret report from June 1949, the CIA mentioned that Alexiu had been promoted to lieutenant general, and was a "devoted Communist". After retiring from the Army in March 1950, he was arrested in January 1954 and set free in September 1954; while in detention, he was investigated for actions taken during the Odessa massacre of October 1941.