to obtain a district court enforcement order under section 921(d) which may lead to contempt proceedings against the employer for noncompliance. See Omni Capital Int’l, Ltd. v. Rudolf Wolff & Co., 484 U.S. 97, 103, 108 S.Ct. 404, 409, 98 L.Ed.2d 415 (1987) (“Before a court may exercise personal jurisdiction over a defendant, the procedural requirement of service of summons must be satisfied. ‘[Sjervice of summons is the procedure by which a court having venue and jurisdiction of the subject matter of the suit asserts jurisdiction over the person of the party served.”’) (citing Mississippi Publishing Corp. v. Murphree, 326 U.S. 438, 444-45, 66 S.Ct. 242, 245-46, 90 L.Ed. 185 (1946)) (emphasis added); Precision Etchings & Findings, Inc. v. LGP Gem, Ltd., 953 F.2d 21, 23-24 (1st Cir.1992) (<HOLDING>) (emphasis added); Jardines Bacata, Ltd. v.
holding that a complete failure to serve a defendant with process deprives the trial court of personal jurisdiction violates due process and results in a judgment that is void as to that defendant and subject to challenge at any time recognizing that it is well settled law that an action is commenced by the service of a summons and without valid service of process the trial court has no jurisdiction to act holding that fedrcivp 4d1 governs the method of service of process in a diversity action holding that actual notice of lawsuit is no substitute for substantial compliance with frcp 4d1 requiring service on person of defendant on suitable resident at defendants dwelling or on defendants agent a  judgment entered by a court which lacks jurisdiction over the person of the defendant is void and may be set aside at any time pursuant to fedrcivp 60b4 personal jurisdiction is established either by proper service of process or by the defendants waiver of any defect in the service of process holding that a defendants actual knowledge that an action is pending or that service has been attempted is not the equivalent of service of summons and will not relieve the plaintiff of its burden or vest the court with jurisdiction