29 U.S.C. § 411
Every member of a labor organization shall have equal rights and privileges within such organization to nominate candidates, to vote in elections or referendums of the labor organization, to attend membership meetings, and to participate in the deliberations and voting upon the business of such meetings, subject to reasonable rules and regulations in such organization's constitution and bylaws.
Every member of any labor organization shall have the right to meet and assemble freely with other members; and to express any views, arguments, or opinions; and to express at meetings of the labor organization his views, upon candidates in an election of the labor organization or upon any business properly before the meeting, subject to the organization's established and reasonable rules pertaining to the conduct of meetings: Provided, That nothing herein shall be construed to impair the right of a labor organization to adopt and enforce reasonable rules as to the responsibility of every member toward the organization as an institution and to his refraining from conduct that would interfere with its performance of its legal or contractual obligations.
Except in the case of a federation of national or international labor organizations, the rates of dues and initiation fees payable by members of any labor organization in effect on September 14, 1959 shall not be increased, and no general or special assessment shall be levied upon such members, except-
No labor organization shall limit the right of any member thereof to institute an action in any court, or in a proceeding before any administrative agency, irrespective of whether or not the labor organization or its officers are named as defendants or respondents in such action or proceeding, or the right of any member of a labor organization to appear as a witness in any judicial, administrative, or legislative proceeding, or to petition any legislature or to communicate with any legislator: Provided, That any such member may be required to exhaust reasonable hearing procedures (but not to exceed a four-month lapse of time) within such organization, before instituting legal or administrative proceedings against such organizations or any officer thereof: And provided further, That no interested employer or employer association shall directly or indirectly finance, encourage, or participate in, except as a party, any such action, proceeding, appearance, or petition.
No member of any labor organization may be fined, suspended, expelled, or otherwise disciplined except for nonpayment of dues by such organization or by any officer thereof unless such member has been (A) served with written specific charges; (B) given a reasonable time to prepare his defense; (C) afforded a full and fair hearing.
Any provision of the constitution and bylaws of any labor organization which is inconsistent with the provisions of this section shall be of no force or effect.
29 U.S.C. § 411