Marxism and Native Americans: Request for Bibliography

[Stannard67 at aol.com]

I am interested in acquiring any and all material dealing with the 
long-standing tensions (and possible permutations) between Native American 
activism and Marxism.  I know Ward Churchill has written critically of 
Marxism, and that some old texts (like George Novack's GENOCIDE AGAINST THE 
INDIANS) deny the uniqueness of the Native American experience in world 
capitalist development.  I am looking for more.  Any ideas?

stannard