The name of the book that I read about the NOI's dealings with Neo-nazi's for financial purposes only is called "The Seventh Child:Family Memoirs of MalcolmX" by Rodnell Collins. This was one of the many reasons Malcolm X left the Nation of Islam as detailed in this book.
Our people have made the mistake of confusing the methods with the objectives. As long as we agree on objectives, we should never fall out with each other just because we believe in different methods, or tactics, or strategy. We have to keep in mind at all times that we are not fighting for separation. We are fighting for recognition as free humans in this society
Malcolm X, 1965