In 1955, he settled in the German Democratic Republic, but soon grew disillusioned because of his dislike of Stalinism and returned to Hamburg (in West Germany).

In 1958, Giordano reported on West German trials of Nazi war criminals for the Central Council of Jews in Germany (Zentralrat der Juden in Deutschland).

In 1964, he joined the Cologne-based West German (Public) Broadcasting institution (Westdeutscher Rundfunk — WDR) as a journalist and remained there until 1988.

Thereafter, Giordano worked as a freelance writer and wrote numerous articles about his experiences in Nazi Germany and about the dangers of Neo-Nazi movements.

[1] Giordano was a close friend of black German-American journalist Hans Massaquoi since their Swingjugend times in wartime Hamburg.