Fascism is when the government controls all industry, both business and labor. Socialism is where the government decides who gets the fruit of industry, both business and labor. Communism is where the government owns all industry, both business and labor.

As for the two extremes of the spectrum, I believe they are totalitarianism on one end, and anarchy on the other. Libertarianism is at the opposite end of the spectrum from socialism.

P.S. Jeff, yes. Exactly like the recent Supreme Court decision.