The Andy Griffith Show (1960)

S6E23 The Gypsies

Andy decides to evict a band of travelers from Mayberry after their antics annoy the townsfolk. Soon after, they establish their camp just outside town and claim to have cast a "curse" that brings a drought to the area. However, it is later uncovered that the whole situation is a ruse, as the travelers are manipulating a radio to create the illusion of their supernatural powers.