 The practice coexists with human trafficking, narcotics, weapons dealing, terrorism, and the evasion of economic sanctions and embargoes.However, the Internal Revenue Service has since instituted new anti-money laundering regulations to control the gem trade.Another intriguing possibility is that a terrorist might buy stocks which are likely to appreciate in the event of a terrorist attack, such as defense industry stocks, or sell short stocks which are likely to depreciate, such as airlines.