The term "essential worker" is not a new one
(truth.prabhupada.org.uk)
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Where in the video do they mention the origin of the term?
Skimmed through a bit, get the idea but looking for the term.
Watched it few days ago, but from what I remember it was in sheindlers' list movie clips.
Basically according to that movie, jews were separated between essential workers and non essential workers. Essential workers were allowed to stay in their homes while others moved to the work camps.