Incident of Fear in the Streets

S1, E17: Trail boss Gil Favor and his ramrod Rowdy Yates leave the herd and race to a nearby town to find doctor for Pete Nolan, who has been badly gored by a steer. After entering the strangely silent town, the two cattlemen discover that they and the rest of the townspeople are the prisoners of Jed Mason and his four sons, who literally take over the town to avenge the mob lynching of the youngest, Mason, accused of murder.