29 CFR 452.13: Extraterritorial application.

Although the application of the Act is limited to the activities of persons and organizations within the territorial jurisdiction of the United States, 14 an international, national or intermediate body is not exempted from the requirements of the Act by virtue of the participation of its foreign locals or foreign membership in its elections. For example, votes received from Canadian members in referendum elections held by an international must have been cast under procedures meeting the minimum requirements of the Act, and Canadian delegates participating at conventions of the international at which officers are elected must have been elected by secret ballot.