[dfwgator]

Fascism and Communism are kissing cousins, both at the same end of the spectrum, and not far from each other, either. As a matter of fact, if you drew Venn diagrams, they would have significant overlap.

The best description I've heard is that they are "two rabid dogs fighting over the same bone."

[rlmorel]

That’s perfect, I think and really describes them well. It paints the mental picture accurately.