29 U.S. Code § 411 - Bill of rights; constitution and bylaws of labor organizations
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:
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:
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.