Why is marijuana illegal now? What's the history of marijuana laws? And why must the government intrude into the personal life of its citizens?
Why is Marijuana Illegal? Because of 2 men; William Randolf Hearst and Harry J. Anslinger
Why is Marijuana Illegal? - Drug WarRant
Greed
Marijuana's potential for producing inexpensive paper made the timber industry nervous, and budding technologies--which put hemp into the competition for synthetic fibers, cellophane, methanol, super-strength plastics, paint, medicines, textiles, ship sails and foods--prompted tycoons who faced billions of dollars in subsequent losses to initiate fear campaigns (spreading claims of insanity and murder) and to lobby for the plant's prohibition.
Racism
In the 1920s and 1930s, marijuana was attacked by spreading fears of falling of collapsing barriers between blacks and whites. The federal narcotics division leader, Harry Anslinger, initiated a campaign to put marijuana at the center of interracial dating and dancing, citing marijuana's popularity in racially mixed jazz clubs.
Prejudice against Mexicans was also exploited by connecting Mexican immigrants--representing cheap labor during the Depression--to the marijuana scene and by renaming hemp as marijuana.
Ignorance
Many Americans believed that marijuana was a violent narcotic in the company of opiates, and people feared that it fomented criminal acts and psychosis. Harry Anslinger was pivotal in proliferating stories of brutal crimes and sexual predation resulting from marijuana use.
Renewed Legalization of Alcohol
Many careers existed to maintain Prohibition, and banning marijuana provided the hope of continuing employment when it was repealed. The Federal Bureau of Narcotics, established in 1930, represented this job security, particularly if widely-used marijuana was added to the list of illegal substances
Why Was Marijuana Made Illegal in the USA? | Trails.com