What is picketing? Explain the various forms of picketing

What will be an ideal response?

Picketing is the stationing of individuals outside an employer's place of business for the purpose of informing passersby of the facts of a labor dispute. Picketing usually accompanies a strike, but it may occur alone, especially when employees want to continue to work in order to draw a paycheck.
Just as there are numerous types of strikes and boycotts, there are multiple types of picketing with different degrees of protection. Informational picketing, designed to truthfully inform the public of a labor dispute between an employer and employees, is protected. This protection may be lost, however, if the picketing has the effect of stopping deliveries and services to the employer. Picketing designed to secure a stoppage of service to the employer is called signal picketing and is not protected.
Jurisdictional picketing, like jurisdictional strikes, occurs when two unions are in dispute over which union's workers are entitled to do a particular job. If one union pickets because work was assigned to the other union's members, this action is unlawful; jurisdictional disputes are resolved by the National Labor Relations Board under an expedited procedure, so there is no need to take coercive action against the employer. The other union or the employer may secure an injunction to preserve the status quo until the board resolves the dispute.
Organizational or recognitional picketing, which is designed to force the employer to recognize and bargain with an uncertified union, is illegal when: 1 ) another union has already been recognized as the exclusive representative of the employees, and the employer and employees are operating under a valid collective bargaining agreement negotiated by that union; 2 ) there has been a valid representation election within the past year; or 3 ) the union has been picketing for longer than 30 days without filing a petition for a representation election.