29 U.S. Code § 525 - Service of process

For the purposes of this chapter, service of summons, subpena, or other legal process of a court of the United States upon an officer or agent of a labor organization in his capacity as such shall constitute service upon the labor organization.

(Pub. L. 86–257, title VI, § 605, Sept. 14, 1959, 73 Stat. 540.)