When we refer to “organizing” workers we are referring to the process of turning a group of individual workers into a cohesive group that can effectively represent their common interests with their employer. This is what people outside the union movement might call "unionizing."
The goal is to apply the rules of labor legislation in order for the workers to be recognized as a unit and to compel the employer to negotiate a binding contract governing their terms and conditions of employment.
Note: If you want to become an IATSE member, you must contact the appropriate local union for your area! Look up the local union information in the Local Union Directory to find the appropriate local union for your area.