I don't read it as calling for unionization, but half-way through the section titled "Inequalities occasioned by the Policy of Europe," I think he argues that t

I don't read it as calling for unionization, but half-way through the section titled "Inequalities occasioned by the Policy of Europe," I think he argues that trade unions are inevitable. > People of the same trade seldom meet together, even for merriment and diversion, but the conversation ends in a conspiracy against the public, or in some contrivance to raise prices. It is impossible, indeed, to prevent such meetings, by any law which either could be executed, or would be consistent with liberty and justice. But though the law cannot hinder people of the same trade from sometimes assembling together, it ought to do nothing to facilitate such assemblies, much less to render them necessary. Search the text[1] for this and you'll see it goes on a bit more and is preceded by some historical context. 1. https://www.gutenberg.org/files/3300/3300-0.txt https://www.gutenberg.org/files/3300/3300-0.txt