'As the Nazis took over, the artwork — by Gustave Courbet, the French realist painter — was carried off and reserved for the collection of a top Nazi official, while the engineer, Robert Bing, joined the French Resistance, working to distribute clandestine newspapers on behalf of the movement.'

https://www.nytimes.com/2023/03/28/arts/courbet-nazi-restitution-cambridge.html