Attorney and liberal activist William Kunstler published a 1964 book titled "The Minister and the Choir Singer", which he re-released with added editorial material in 1980 as "The Hall-Mills Murders". In his book, Kunstler theorized that the Ku Klux Klan had been responsible for the couple's demise, based on the facts that the Klan was a very violent organization and was active in New Jersey in the 1920s. But he acknowledged that the Klan had not previously killed anyone in the state, and his reasons for thinking the group would target this particular couple were admittedly speculative.