Unions are not perfect and unionized workers often have a complicated relationship with their union, but fundamentally a Union is just a democratic organization

Unions are not perfect and unionized workers often have a complicated relationship with their union, but fundamentally a Union is just a democratic organization representing workers. The policies are set by the union on behalf of the interests of workers, however imperfectly. Without a union, the policies are set by management and there is no institutional power that workers have collectively against policies they don’t like.