[3] In 1938, Heumann was economically ruined by the Nazi's racial persecution: forced out of his own banking house, he had to pay the "Judenvermögensabgabe" and was no longer allowed to manage his own financial affairs, as a "Sicherungsanordnung" had been issued over his assets.
He was forced to sell artworks, including three Fendi and Gensler prints, to ensure the family's livelihood.
In recognition of his persecution, the Kupferstich-Kabinett der Staatlichen Kunstsammlungen Dresden, the Stiftung Preußischer Kulturbesitz in Berlin and the Städtische Galerie im Lenbachhaus und Kunstbau München, among others, approached Carl Heumann's descendants in order to find a just and fair solution regarding the artworks from his collection.
[4][5] In 2020, the Staatlichen Kunstsammlungen Dresden (SKD) restituted three graphic works from the Kupferstich-Kabinett to Heumann's family.
[6] For "Provenance Research Day" on 14 April 2021 Heumann's granddaughter, Carol Heumann Snider, talked with provenance researchers Dr. Katja Lindenau (Staatliche Kunstsammlungen Dresden) and Melanie Wittchow (Lenbachhaus), about her grandfather and her father Thomas Heumann, describing how she preserves their stories and memories for her children and grandchildren.