In a letter last week, current NLRB Regional Director Kathy Drew King dismissed claims that Trump has been using his position to silence his own employees. The letter states that the Board’s investigation found no evidence that the widely encompassing nondisclosure agreement that he passed was ever applied by Trump Organization Inc. to any employee covered by federal law.
See "NLRB dismisses claims targeting Trump Organization's nondisclosure agreement", Robert Iafolla, Reuters, December 8, 2017