chapter 4 of mice and men
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Lenny could easily say something to get himself into trouble. He also would give away the news about the farm.
He wasn't happy because they weren't supposed to be in a "black" man's room.
In a second George stood framed in the door, and he looked
disapprovingly about. "What you doin' in Crooks' room? You hadn't
ought to be here."
Crooks nodded. "I tol' 'em, but they come in anyways."
"Well, why'n't you kick 'em out?"
"I di'n't care much," said Crooks. "Lennie's a nice fella."
Of Mice and Men
I don't think it was specifically a "black man's room". George was paranoid period of Lennie venturing out of the barn or bunkhouse. Just my take!