The necessities of the struggle impel the workers to support one another across political boundaries and professions. The more active the struggle becomes, therefore, the stronger and more extensive this federation of proletarians must become. And some narrow-minded economists accuse this federation of workers, represented by the International, of instigating strikes and creating anarchy! This, very simply, is to mistake the effect for the cause: the International has not created the war between the exploiter and the exploited; rather, the requirements of that war have created the International.
~ Bakunin, 1869