There's plenty of currently existing unions for professional trade workers. The SEIU, IFPTE, CWA, IBEW, etc. are American unions which represent scientists, engineers, legal assistants, technicians, physicists, nurses, etc. Largely these careers have low union density (as a result of poor uptake of unions throughout the US), but there are plenty of countries (for example many Nordic countries) where its much more common to see these professions unionized.

If you're interested in learning more about how to do this, I suggest you look into one of the following orgs:

- Tech Workers Coalition (https://techworkerscoalition.org/) based in the Bay Area who holds a monthly organizing meeting in SF

- Tech Solidarity (https://techsolidarity.org), which has been holding meetings in a bunch of metropolitan areas for educating tech workers about organizing