Heinz Rauch was one of hundreds of thousands of Communist Party members in the Soviet zone who lost no time in signing their Communist Party membership over to the new party. Still in Saxony, during 1946/47 he served as Party Secretary in Bautzen and as a member of the regional party executive (""Bezirksvorstand"") for East Saxony (as the Dresden region was identified at the time). A further practical indication that Rauch had found favour with the military authorities and party establishment came in 1947/48, during which time he served as head of the Soviet News and Information Service for East Saxony. It was also during 1948 that his wife and the couple's (at this stage two) children relocated from Sweden to join him, reuniting the young family in the Soviet occupation zone. Märta took a job in the foreign trade sector. In 1947 Rauch became a member of the Vereinigung der Verfolgten des Naziregimes (VVN / ""Union of Persecutees of the Nazi Regime""). Between 1948 and 1950 Rauch worked as the head of the Agitation section with the national leadership committee of the "Freier Deutsche Gewerkschaftsbund" (FDGB / ""Free [East] German [National] Trade Union Federation"". It was during this period, in October 1949, that the Soviet occupation zone was formally relaunched as the Soviet sponsored German Democratic Republic (East Germany). In November 1950 Rauch accepted a position as senior press officer (""Pressereferent"") with the East German Ministry of Labour. In February 1951 he was installed as chairman of a government audit commission. Also in 1951 he took a consultancy position with the : in January 1952 he became first deputy head. Between 1953 and 1955 he undertook a correspondence course with the "Karl Marx" Party Academy in Berlin. Clearly marked out for further party-political advancement, between September 1956 and September 1957 Rauch was in Moscow, attending the of the Soviet Communist Party Central Committee. On his return from Moscow, in October 1957 Heinz Rauch succeeded as head of the . On 19 July 1958 Rauch was appointed to membership of the important , then under the chairmanship of . On 4 July 1962 he was also appointed to the Ministerial Council. Among his other appointments, Heinz Rauch was made a member of the party's National Audit Commission (""Zentralen Revisionskommission der SED"") at the in April 1954.