blackmarket

/B L AE1 K M AA1 R K AH0 T/
noun
  1. 1

    Trade that is in violation of restrictions, rationing, or price controls

  2. 2

    The people who engage in such trade (considered as a group), or that sector of the economy

Source: https://en.wiktionary.org/wiki/black%20market, https://en.wiktionary.org/wiki/blackmarket