labor dispute
(c) Bar To Prosecution .— It is a bar to Federal prosecution under subsection (a) for conduct that occurred within the United States that the conduct involved was during or in relation to a labor dispute, and such conduct is prohibited as a felony under the law of the State in which it was committed. For purposes of this section, the term “labor dispute” has the meaning set forth in section 13(c) of the Norris-LaGuardia Act, as amended ( 29 U.S.C. 113(c) ).