National Lampoon's Vacation: The Aunt Edna ordeal...
I wish Bob Marley would've been around to sing this song to Ma during this scene:
The man took two steps backward. "Well, you ain't in your country now. You're in California, an' we dont want you goddamn Okies settlin' down."
Ma's advance stopped. She looked puzzled. "Okies?" she said softly. "Okies."
"Yeah, Okies! An' if you're here when I come tomorra, I'll run ya in." He turned and walked to the next tent and banged on the canvas with his hand. "Who's in there?" he said.
Ma went slowly back under the tarpaulin. She put the skillet in the utensil box. She sat down slowly. Rose of Sharon watched her secretly. And when she saw Ma fighting with her face, Rose of Sharon closed her eyes and pretended to be asleep.
(GoW--Chapter 18, Page 214)
Intimidation and/or shakedowns of the migrants by the California State Police weren't unheard of:
"Blowin' Down The Road" ("I Ain't Gonna Be Treated This Way")--Woody Guthrie