It has also been speculated that the song contains numerous references to post-World War II American political events, such as the assassination of John F. Kennedy (known casually as "Jack") and subsequent killing of his assassin (whose courtroom trial obviously ended as a result ("adjourned")), the Cuban missile crisis ("Jack be nimble, Jack be quick"), the murders of civil rights workers Chaney, Goodman, and Schwerner, and elements of culture such as sock hops ("kicking off shoes" to dance, preventing damage to the varnished floor), cruising with a pickup truck, the rise of the political protest song ("a voice that came from you and me"), drugs and the Counterculture, Charles Manson's family and murders in the "summer swelter" of 1969 (the Beatles' song "Helter Skelter" had often been quoted by Manson to justify the killings), and much more.