A word used mostly in the context of communism not identified in the USA – etymology dictionary explanation above. RS uses it in his discussion of the World Economy a lot:
1650s (n.) "member of the lowest class;" 1660s (adj.) "of the lowest class of people;" with -ian + Latin proletarius "citizen of the lowest class" (as an adjective, "relating to offspring"), in ancient Rome, propertyless people, exempted from taxes and military service, who served the state only by having children; from proles "offspring, progeny" (see prolific).
https://wn.rsarchive.org/Lectures/GA340/English/RSP1972/19220805a01.html – originally I looked for the word value & then “the nature of value” and landed on 48 uses in the above lecture.
Happy New Year Y’ALL .. Let there be light in the coming times
google China Uyghurs problems