American psychologist and drug taker Timothy Leary (1920-1996) ran for Governor of California in the 1960s, against future President Ronald Reagan. Leary’s campaign slogan was “Come Together, Join the Party,” and apparently Lennon copped this for the chorus to this 1969 single and Abbey Road album grooving, bluesy classic. The song is sort of a campaign theme song for Leary.
Leary spent time in many jails for his views that drugs could aid psychiatry, for treating people. Another President, Richard Nixon, called him the most dangerous man in the country.
Perhaps in the twenty-first century, collective hysteria over psychedelic drug use seems quaint. Yet the official “War on Drugs” continues, and many talents were forever lost prematurely, partly due to drugs (Jimi Hendrix, for instance).