[1] After the war, Ziegler was a prominent leader of the Socialist Unity Party of West Berlin (SEW).
In autumn 1934 the Zieglers opened two bookshops, that functioned as centres of distribution of underground anti-fascist propaganda.
[3] As the Second World War drew closer, Erich Ziegler and Heinz Kapelle built up a resistance group in Berlin.
[6] Once the war broke out in 1939, the group to which the Zieglers belonged began distributing anti-war propaganda in Berlin, calling for the overthrow of Adolf Hitler and demanding an end to hostilities with neighbouring countries.
[2] During this period Ziegler worked closely with the youth secretary of the Communist Party, Erich Honecker.
[7] Ziegler took part in the construction of the Free German Youth and the Democratic Sports Movement of Greater Berlin.
[2] Ziegler led the SEW delegation at the 1976 Conference of Communist and Workers Parties of Europe, held in East Berlin.