Bonanza - Season 1 - Eps 20: The Fear Merchants
The Cartwrights encounter racial bigotry in Virginia City and end up protecting a Chinese boy from mob violence. Victor Sen Yung, in his largest role to date, speaks normally in the presence of his fellow countrymen, but reverts to broken English when with the Cartwrights.
About Bonanza

Title: Bonanza
First Air Date: 1959-09-12
Last Air Date: 1973-01-16
Status: Ended
Rating: 7.5/10 (from 440 votes)
Language: EN
Seasons: 14
Total Episodes: 431
Network: NBC
Genres: Western, Action & Adventure, Drama, Family
Production Companies: NBC, NBC Studios
Synopsis
The High-Sierra adventures of Ben Cartwright and his sons as they run and defend their ranch while helping the surrounding community.
Cast

Lorne Greene
Ben Cartwright

Michael Landon
Joe Cartwright

David Canary
Candy Canaday

Tim Matheson
Griff King

Mitch Vogel
Jamie Hunter Cartwright