Bush senior was involved in supplying arms to the Nicaraguan Contras in S. America, he was using drug money to finance this. The Contras were a bunch of right wing terrorist who were trying to overthrow the left wing elected goverment. He was also mixed up with Iran. Lovely family with real Christian morals. And the US public elected him and his son.
A search on Google was all that was needed. Its here;
Bush & the Contras