Hempen homespuns
Bottom the weaver and his fellow tradesmen are called, rather patronizingly, "hempen homespuns" and "rude mechanicals*" by Puck, and "hard-handed men" (because they work with their hands; see 5.1.72) by Philostrate, the master of the revels at the court of Theseus.
The ancient tradition of the mystery plays was that a single guild of workmen would put on each play. Shakespeare, however, has created an acting company made up of several different trades--of which there were many in the City of London.
Footnotes
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Bottom is a mechanic?
See 3.1.76 and 3.2.9. "Mechanicals" is used in an archaic sense, meaning those who work with their hands rather than machines.