Shadow Over Elveron (1968)

James Franciscus plays Matthew Tregaskis, a young doctor attempting to start a medical practice in a town rife with corruption, secretive business deals, and official intimidation in the form of the local sheriff, played by Leslie Nielsen in a role that earned him hate mail after the movie was aired on NBC's "Tuesday Night at the Movies." Tregaskis tries to do business honestly despite the corruption, but when a murder trial involving local powers is about to end in a coverup, he is determined that justice will be done, despite threats from the crooked Sheriff.