I would encourage anyone in tech that is interested in forming a union at their workplace to sign up for CWA's CODE (Campaign to Organize Digital Employees) training: https://code-cwa.org/

CWA is a big, traditional, national union (think phone company employees, health care workers, flight attendants) that has voted to set aside a portion of their dues to help organize us, their fellow workers in the tech sector, which I consider a truly beautiful act of solidarity. They are having some successes, which seem to be building.

Getting plugged in with the training and, almost as importantly, a CWA organizer, is a great first step if you know you'd like a union but don't know where to start.