Except for the field organizers of strikes, who were pretty tough monkeys and devoted, most of the so-called Communists I met were middle-class, middle-aged people playing a game of dreams. I remember a woman in easy circumstances saying to another even more affluent: “After the revolution even we will have more, won’t we, dear?” Then there was another lover of proletarians who used to raise hell with Sunday picnickers on her property.

I guess the trouble was that we didn’t have any self-admitted proletarians. Everyone was a temporarily embarrassed capitalist. Maybe the Communists so closely questioned by the investigation committees were a danger to America, but the ones I knew — at least they claimed to be Communists — couldn’t have disrupted a Sunday-school picnic. Besides they were too busy fighting among themselves.

John Steinbeck (1902-1968) American writer

“A Primer on the ’30s,” Esquire (1 Jun 1960)
    (Source)

Collected in American and Americans (1966).

A portion of this was paraphrased in Ronald Wright, A Short History of Progress (2004): "John Steinbeck once said that socialism never took root in America because the poor see themselves not as an exploited proletariat but as temporarily embarrassed millionaires." That paraphrase has, in turn, been frequently cited as a direct quotation of Steinbeck.