[1] He was a member of the Hamburg State Parliament for the KPD in the first legislative period after the war.

Gundelach was then a member of the Zone Advisory Council in 1947/48.

He was a member of the German Bundestag in the first legislative period (1949-1953).

Biographisches Handbuch der Mitglieder des Deutschen Bundestages.

1949–2002 [Biographical Handbook of the Members of the German Bundestag.