Professor Mamlock Russian is a 1938 Soviet drama film, directed by Herbert Rappaport and Adolf Minkin. It is one of the earliest film directly dealing with the persecution of Jews in Nazi Germany.
German author Friedrich Wolf composed a theater play by the same name while in French exile, during 1933. It was first performed in Warsaws Yiddish Theater. Director Rappaport saw it in a Moscow theater and decided to adapt it to screen, albeit with considerable differences form Wolfs play among others, portraying the protagonist being executed rather than committing suicide. Georges Sadoul recalled the playwright told him that during World War II, he visited a Red Army unit at the front many of those present watched the film. He was asked to recount the plot of Professor Mamlock, which he did based on the play the soldiers judged his summary so inaccurate that he might have been shot had an officer not recognized him.The film is considered as the first ever made about the Holocaust. Principal photography took place in Leningrad. ........
Source: Wikipedia