Workers have the right to join labor organizations, also known as unions, if they choose to. Labor organizations may help protect workers' rights and make sure they are treated fairly. Unions help workers by negotiating agreements with employers that govern working conditions. For example, unions can help negotiate better pay rates, benefits, and retirement packages for workers.
Some employers might try to stop their employees from joining these groups because employers may view unionization as a nuisance that reduces productivity and adds costs for employers. However, unions play a vital role in balancing the unfair bargaining power that employers hold over individual workers.
As a result, California has employee protection laws that make it illegal for any employer, manager, or supervisor to force someone to agree not to join a labor organization just to get a job or keep it.
(See Link(s): Labor Code section 922)