...Court of the United States or of any Territory or possession, or the United States District Court for the District of Columbia, within the jurisdiction...Labor or representative designated by him, shall have jurisdiction to issue to such person an order requiring such person to appear before him or representative...

...refusal to obey a subpena issued to any person under subsection (b). any court of the United States within the jurisdiction of which the inquiry is carried...on or within the jurisdiction of which said person guilty of contumacy or refusal to obey is found or resides or transacts business, upon application...

...United States court of any territory or possession, or the District Court of the United States for the District of Columbia, within the jurisdiction...on or within the jurisdiction of which said person guilty of contumacy or refusal to obey is found or resides or is domiciled or transacts business, or...