<P> encouraging the practice and procedure of collective bargaining and by protecting the exercise by workers of full freedom of association, self - organization, and designation of representatives of their own choosing, for the purpose of negotiating the terms and conditions of their employment or other mutual aid or protection . </P> <P> Various definitions are explained in section 2, (29 U.S.C. § 152) including 2 (5) defining "labor organization" and 2 (9) defining "labor dispute". The Act aims to protect employees as a group, and so is not based on a formal or legal relationship between an employer and employee . </P> <P> The National Labor Relations Board (NLRB), which was established in NLRA 1935 sections 3 to 6 (29 U.S.C. § 153--156), is the primary enforcer of the Act . Employees and unions may act themselves in support of their rights, however because of collective action problems and the costs of litigation, the National Labor Relations Board is designed to assist and bear some of the costs . Under section 3, (29 U.S.C. § 153) the NLRB has two basic functions: overseeing the process by which employees decide whether to be represented by a labor organization and prosecuting violations . Those processes are initiated in the regional offices of the NLRB . The General Counsel of the National Labor Relations Board give legal advice . Sections 4 (29 U.S.C. § 154) and 5 (29 U.S.C. § 155) set out provisions on the officers of the Board and their expenses . Section 6 (29 U.S.C. § 156) empowers the Board to issue rules interpreting the labor legislation . This will generally be binding, unless a court deems it to have acted outside its authority . </P> <P> Under section 10 (29 U.S.C. § 160) the NLRB is empowered to prevent unfair labor practices, which may ultimately be reviewed by the courts . Under section 11 it can lead investigations, collect evidence, issue subpoenas, and require witnesses to give evidence . Under section 12 (29 U.S.C. § 162) it is an offense for people to unduly interfere with the Board's conduct . </P>

Which of the following acts is also known as the wagner act