What you'll often see is a group of undocumented immigrants doing scut work - doing sweeping up, carrying heavy stuff, setting up the machinery, working alongside either native-born or documented immigrants who are doing the higher-paid skilled work - carpenters, electricians, plumbers, that sort of thing.

NPR: Immigrants Tend To Complement, Not Replace American Jobs

Carpenters who are members of trade guilds recognize the scribing tradition as having a symbolic and initiatory meaning that remains a secret.

UNESCO: Intangible Cultural Heritage