Beneschek was a Sudenten German and Communist, hiding in Bialystok from the Gestapo under a false identity. As manage of a textile mill situated on the border of the ghetto, he employed both Jews and Poles, and was instrumental in making it possible for Jews to smuggle arms into the ghetto.

Beneschek also provided the Jews with false documents and money and introduced another Sudenten German by name of Kudlatschek to the Jewish resistance organisation.

Source

The Holocaust - Martin Gilbert, page 486