This film is a condemnation of public relations at its worst. As one character says, "taking public opinion is useful; making public opinion is dangerous". This seems to call forth the idea of "engineering consent", an idea that Edward Bernays first published in 1947.
We also have the concepts of "pre-written law" and "fake front groups with high-sounding titles". With that, we see a strong parallel between Communist infiltration and modern-day political movements. And the groups could be left or right-leaning. There is much talk today (2013) of ALEC writing bills and groups like Americans For Prosperity that are little more than a tool of Charles and David Koch.
The film calls out the danger of misleading polls, and the difference between advertising and politics. What was seen as a danger in this film is now standard practice fifty years later. A candidate is "sold" to the American people and polls rarely get to the heart of any matter. Like the discussion in the film about "Jews" and "labor unions", the lobbyists and advertisers know how to target narrow segments of the population...
Jacques Tourneur biographer Chris Fujiwara says Tourneur's later films, including this one, "fall short of the standard of his prior work." He says Tourneur himself "thought the film was a failure". To say this is a challenge. From the point of view of directing and cinematography, this might not reach the level of "Cat People" or "Night of the Demon". But the message is so powerful that the direction almost becomes secondary.
Could this be a forgotten gem in need of a new release?