It seems I have been challenged for a source about what i wrote about the 6th Rebbe. So I will quote from none other than Bryan Mark Rigg, who wrote the book on how Rav YY Shneerson escaped the Nazis:
…[T]he Rebbe [Joseph Isaac Schneersohn] of course wanted to escape Europe and had his movement employ every means, even approaching the Secretary of State, to get him out, but when he was here in the US, he did not approach those very same people to help rescue those who had to remain in Europe. However, he did approach those people in the government to rescue his library, which he did get out in 1941. Are books more important than people? Some of the books were secular like Dante’s Inferno and books on Communism. This is a sad part of the history of the Rebbe. Also he started [publicly] condemning people who were organizing amazing rescue efforts like rabbis Kotler and Kalmanowitz of the Vad-Haatzala.
He claimed they and Reform and Kofrim Jews were causing the Holocaust with their non-Kosher ways. Yet, we see that Kotler and Kalmanowitz helped rescue up to 100,000 people with the War Refugee Board. The Rebbe felt they were unnecessarily compromising their religious integrity by meeting with politicians on the Sabbath and secular and reform leaders. So the Rebbe made mistakes and according to Chancellor or Yeshiva University, Norman Lamm, he committed blasphemy by claiming God was punishing the Jews for their sins with the Holocaust. He claims this is a desecration of God’s name (Menachem Mendel Schneerson also said that saying such a thing is a desecration of God’s name without mentioning his father-in-law). These facts and many more show how much Chabad does to ignore unpleasant facts about their history. They just claim that when people write such things, they are jealous of their movement, do not understand their people or on a political campaign to smear them. Very weak arguments and signs of inferiority complexes. So basically this story shows that instead of pointing fingers, we need to act and make a difference. Small minds blame others; big ones blame themselves and then seek out action to make the situation better.
What people wanted was a hero of the Jewish people fighting for their rights. Instead, the Rebbe just thought of himself and his movement and condemned others. He was not helping the problem, but creating more. He should have worked with [Rov] Kotler and [Rabbi] Kalmanowitz, or at least have tried to, instead of [publicly] condemning them and a host of others.