Lewis -- Do you have any (workable) alternatives to corporations existing or not?(Communism was tried and proved to fail)
Well, I think here's an interesting point. Now, there are just corporations, and so they can be authoritarian.
The way in which I find that corporations can be authoritarian is that the job policy is in their hands. They choose who work and where, and according to such or such country, they choose for which price. The work is the base of a human society, if you largely control the work, don't you largely control how work a society? Even if there are a lot of different companies in different countries, they all work on the same model, the current one, which give them a large power on a human society by work, and globalization increases that a lot: "Shut up or I go to China". And once in China: "That's fine, everybody shut up here". You wanna work? Shut up.
So, maybe we can't say corporations are authoritarian, but the current economic model which gives so much power to corporations is authoritarian to workers.