I think the best works that you can research would be to read his speeches from his time with the Nation of Islam to his death. If you read a variety of speeches, not just one era or the other, You will get a better idea of his journey.
the Malcolm X official Website is:
http://www.cmgww.com/historic/malcolm/index.htm
Here is a link to his speeches:
http://www.brothermalcolm.net/mxword...idarchive.html
Please do not think of Malcolm X as a Radical unless it is meant in a good way: I believe his goal was to create a people of pride, Self sufficiency, and of hope.
That is one person's opinon, but, please read about him for yourself. The Autobiography of Malcolm X as told to Alex Haley is a good start. I buy extra copies to give to all the children I can find under 18.