The theory, plan, or practice of trade-union action (originally as advocated and practiced by the French Confédération Générale du Travail) which aims to abolish the present political and social system by means of the general strike (as distinguished from the local or sectional strike) and direct action of whatever kind (as distinguished from action which takes effect only through the medium of political action) -- direct action including any kind of action that is directly effective, whether it be a simple strike, a peaceful public demonstration, sabotage, or revolutionary violence. By the general strike and direct action syndicalism aims to establish a social system in which the means and processes of production are in the control of local organizations of workers, who are manage them for the common good.

a radical political movement that advocates bringing industry and government under the control of labor unions

Syndicalism refers to a set of ideas, movements, and tendencies which share the avowed aim of transforming capitalist society through action by the working class on the industrial front. For syndicalists, labor unions are the potential means both of overcoming capitalism and of running society in the interests of the majority. Industry and government in a syndicalist society would be run by labor union federations.