20 C.F.R. § 501.12 Intervention.
Title 20 - Employees' Benefits
The Board may permit any person whose rights may be affected by any proceeding before the Board to intervene therein whenever such person shows in a written petition to intervene that such rights are so affected. The petition should state with precision and particularity (a) the rights affected; and (b) the nature of any argument he intends to make.
Title 20: Employees' Benefits
PART 501—RULES OF PROCEDURE
§ 501.12 Intervention.