(a) As used in this Code section, the term:

(1) "Labor organization" means any labor union or any organization or agency or employee representation, committee, or plan in which employees participate and which exists for the purpose, in whole or in part, of dealing with employers concerning grievances, labor disputes, wages, rates of pay, hours of employment, or conditions of work.

(2) "Local" means any local agency or branch or dues or assessment collecting unit or affiliate of a labor organization. A labor organization shall also be a local when it collects dues or assessments directly from its members and not through the medium of a branch or another local.

(b) No labor organization and no local shall call or cause any strike, slowdown, or stoppage of work in this state until after 30 days' written notice is given by the labor organization or local to the employer, stating the intention to call the strike, slowdown, or stoppage of work and giving the reasons therefor.

(c) Nothing in this Code section shall apply to any labor organization or local in a seasonal industry such as the ladies' garment, hat and millinery, and men's clothing industry, nor shall any provision of this Code section apply to labor unions of railroad employees operating under the Railway Labor Act.

(d) Any person violating any of the provisions of this Code section shall be guilty of a misdemeanor.