Who is Wiesel speaking of in the passage above?

Who is Wiesel speaking of in the passage above?

The passage:

"No doubt, he was a great leader. He mobilized the American people and the world, going into battle, bringing hundreds and thousands of valiant and brave soldiers in America to fight fascism, to fight dictatorship, to fight Hitler. And so many of the young people fell in battle. And, nevertheless, his image in Jewish history -- I must say it -- his image in Jewish history is flawed."