22 U.S. Code § 4116 - Prevention of unfair labor practices
If the Department or labor organization is charged by any person with having engaged in or engaging in an unfair labor practice, the General Counsel shall investigate the charge and may issue and cause to be served upon the Department or labor organization a complaint. In any case in which the General Counsel does not issue a complaint because the charge fails to state an unfair labor practice, the General Counsel shall provide the person making the charge a written statement of the reasons for not issuing a complaint.
The labor organization or Department involved shall have the right to file an answer to the original and any amended complaint and to appear in person or otherwise and give testimony at the time and place fixed in the complaint for the hearing.
The General Counsel may prescribe regulations providing for informal methods by which the alleged unfair labor practice may be resolved prior to the issuance of a complaint.
The Board (or any member thereof or any individual employed by the Board and designated for such purpose) shall conduct a hearing on the complaint not earlier than 5 days after the date on which the complaint is served. In the discretion of the individual or individuals conducting the hearing, any person involved may be allowed to intervene in the hearing and to present testimony. Any such hearing shall, to the extent practicable, be conducted in accordance with the provisions of subchapter II of chapter 5 of title 5, except that the parties shall not be bound by rules of evidence, whether statutory, common law, or adopted by a court. A transcript shall be kept of the hearing. After such a hearing the Board, in its discretion, may upon notice receive further evidence or hear argument.
If the individual or individuals conducting the hearing determine that the preponderance of the evidence received fails to demonstrate that the Department or labor organization named in the complaint has engaged in or is engaging in an unfair labor practice, the individual or individuals shall state in writing their findings of fact and shall issue an order dismissing the complaint.