Union labor relations are often conducted by union leaders who advocate on behalf of the entire union during negotiations with an employer, often referred to as "collective bargaining". The idea behind labor unions is that the interests of the group will be better served if they negotiate with the employer as one collective vote. On a federal level, labor union law is governed by the National Labor Relations Act ("NLRA") which ensures the rights of individuals to be part of and be represented by unions. The NLRA prohibits employers from disrupting or intruding on the selection process of unions and prohibits employers retaliating against individuals who join unions. The NLRA has created the National Labor Relations Board ("NLRB"), an administrative agency that adjudicated disagreements between individual employers and labor unions. Generally, the NLRA applies to nearly all non-agricultural employers who take part in a business that in some way affects interstate commerce. Labor union law on the state level is generally very similar to the federal NLRA standards; however, state laws may go one step further and cover employers that the NLRA does not reach.