I agree that Mutt isn’t a communist but what is the difference between a corporatist and a fascist.
See 31.
Some fascists were corporatists, but not all by any means. And not all corporatists were fascists.
Corporatism was essentially a (European) conservative attempt to find a "Third Way" between Anglo-American capitalism and representative democracy and Marxist socialism. Though it also had liberal (approximately in the modern American sense of the word) and even anarchist strains.
It never really worked out.
Wiki actually has a pretty good article on the subject.
http://en.wikipedia.org/wiki/Corporatism