The investigation of a jurisdictional dispute under section 10(k) is initiated by the filing of a charge, as described in § 101.2 , by any person alleging a violation of paragraph (4)(D) of section 8(b). As soon as possible after a charge has been filed, the Regional Director serves on the parties a copy of the charge together with a notice of the filing of such charge.
29 C.F.R. §101.31