County Fair (1950)
County Fair is a 1950 American drama film directed by William Beaudine and starring Rory Calhoun, Jane Nigh and Florence Bates. It was a remake of the 1932 film The County Fair, which had also been remade in 1937. A group of locals thwart the plans of a group of criminals to fix a race by doping a horse.
More at Wikipedia.