decertify

verb2

1. •
   To annul the certification of.

   • Nigeria was tagged as a transit-route of drug carriers. This prompted the United States government to decertify the country. — 2003
2. •
   To annul a labor union.

   • As Sallas immediately said, the 130 scabs who so easily replaced the striking printers in '85 won't be foisted upon the union--to degrade it and possibly decertify it. — 1988