Parsons became interested in population control during the 1960s, and began the research that led to a significant body of books and articles being published between 1971 and 1998. His thesis was that overpopulation can be seen as a threat to personal liberty and that the governments of developed countries deliberately encouraged unsustainable population growth as a form of political control. This was first proposed in Parsons' 1971 monograph Population Versus Liberty, and developed further over the following decades, culminating in his two-volume monograph A Study of the Pursuit of Power Through Numbers in 1998. Parsons also saw himself as a maverick and a thorn in the side of the political establishment, believing that it deliberately sought to suppress his research. His detractors regarded him as a conspiracy theorist. In 1971 he founded his own publishing company, the Population Policy Press, primarily to publish his own work, claiming that reputable academic publishers refused to do so on account of its controversial nature. In his last major published work, The Treason of the BBC, Parsons accused the British Broadcasting Corporation of suppressing the debate around overpopulation.
Blackhill campaign
In 1959 Parsons read about the political controversy that had emerged following the announcement by the NationalCoal Board that Blackhill Colliery, near the village of Scremerston in Northumberland, was to close with the loss of 160 jobs. Parsons was working for the NCB at the time. It was rumoured that the decision was the result of a national deal that had been made between the NCB and the National Union of Mineworkers to manage the contraction in the coal industry that had been necessitated by falling demand in the late 1950s. Parsons wrote an article condemning the centralised decision making that had driven the process, arguing that the local community and businesses dependent on the mine should have been involved. On the advice and encouragement of his friend, the Free Cinema filmmaker Karel Reisz, Parsons then decided to make a documentary about the campaign, despite being an amateur with no formal training in or prior knowledge of film production. The film was produced in his spare time between 1959 and 1963, with the only professional help coming from a completion grant provided by the British Film Institute's Experimental Production Fund in the final months of the process. Given the film's amateur provenance, it received a surprisingly positive reception by critics following the first screenings in the winter of 1963-64: The Observers reviewer, for example, described The Blackhill Campaign as 'a much more powerful and real thing to give film goers than the numbing second features that are pumped out satisfy their alleged appetite'. Despite the positive reception of The Blackhill Campaign, Parsons returned to his career as a sociologist and did not make any further films. Blackhill had disappeared from the British Film Institutes's non-theatrical distribution catalogue by the late 1960s, and was in effect a lost film until its rediscovery and restoration by the Northern Region Film and Television Archive in 2004.
