I'm going to assume you're not in the UK, because this is straight out of UK government's playbook during the 70s and 80s when they were union busting the mining and engineering unions. The page on Wikipedia about the union leader Derek Robinson is an eye-opener ( https://en.wikipedia.org/wiki/Derek_Robinson_(trade_unionist... ) ... pay close attention to the work of MI5 in bringing his union activity to an end.