Al Jolson was Jewish.
“Al Jolson was Jewish.”
In the movie “The Jazz Singer”, as the Jolson character is putting on blackface in front of a mirror, for a moment the image dissolves and he sees in the mirror and image of the suffering Jewish people -— ie, he grasps the similarity between the sufferings of the Jews and the sufferings of black people.
It is a statement intended to evoke sympathy for the black condition.