Interesting it was in 1965, around the time of the Cultural Revolution in China which forced masses of non-working class people to leave the cities and work on farms.
(I'm not certain of the exact timing of the farm labor program in China.)
I didn't mean to say it was too similar - the US participants weren't participating forced labor as punishment for their economic class, lasting years, by a violent political movement.
(I'm not certain of the exact timing of the farm labor program in China.)