You can, because the ideas behind the theory that form it are based on the recognition of certain things. For example, socialism recognises that there is a grave inequality in our world, that the majority are often opressed to fuel the greed of the few, and that our society which claims to be a meritocracy is nothing of the sort.

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Trust me, I'm a socialist!

There's power in a factory,power in the land, power in the hand of the worker. But it all amounts to nothing if together we don't stand, there is power in a union.
The union forever defending our rights, down with the blackleg, workers unite. To our brothers and our sisters in many far off lands, there is power in a union.
Money speaks for money, the devil for his own. - Billy Bragg