After a decade of U.S. government scare propaganda that convinced Americans that crazed Mexicans, blacks and fans of jazz clubs were pushing marijuana "reefers" on school children and honest youths, turning them into raving murderers, politicians decided to act. The U.S. Congress passed the Marijuana Tax Stamp Act. Growing and selling marijuana were still legal, but only if you bought a $1 government stamp. And that stamp was not for sale. On the day the Marijuana Tax Stamp Act was enacted -- Oct. 2, 1937 -- the FBI and Denver, Colo., police raided the Lexington Hotel and arrested Samuel R....