Both Uses

proletariat
in
Main Street, by Sinclair Lewis
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He hitched out of his chair, made coffee, gave Carol a cup, and talked on, half defiant and half apologetic, half wistful for friendliness and half amused by her surprise at the discovery that there was a proletarian philosophy.†
Chpt 10 *
Do you want to sacrifice yourself in such a topsy-turvy world, where popularity makes you unpopular with the people you love, and the only failure is cheap success, and the only individualist is the person who gives up all his individualism to serve a jolly ungrateful proletariat which thumbs its nose at him?†
Chpt 38

proletariat = a social class consisting of those who must work for wages to support themselves

Definitions:

(1) (proletariat)
a social class consisting of those who must work for wages to support themselves
(2) (meaning too rare to warrant focus)