It is a violation of section 512(c) of the Act for any person to
unlawfully resist, oppose, impede, intimidate, or interfere with any
official of the Department of Labor assigned to perform an
investigation, inspection, or law enforcement function pursuant to the
Act during the performance of such
duties. (Other Federal statutes which prohibit persons from interfering
with a Federal officer in the course of official duties are found at 18
U.S.C. 111 and 18 U.S.C. 1114.)