A former German Security Service member, fluent in five languages including Yiddish and Polish, Rudolph was involved with organizing Red Cross inspection tours of Auschwitz and other camps during the war. He wrote numerous Revisionist articles. He accompanied Fred Leuchter as translator to Auschwitz and Maidanek in 1988. He was charged and convicted for publishing a newsletter disputing the "Six Million" story. Zündel witness in the 1985 and 1988 Great Holocaust Trials.
Imprisoned in Germany for lengthy stints for "doubting the Holocaust", even though he was in his mid-eighties at the time.