So little is said about unions today. There was a time when newspapers had a "union beat", and you'd read about who was elected head of the UAW local and how the Steelworkers negotiations were going. It's been a long time since WCFL radio, "The Voice of Labor in Chicago".
Few people know how unions work any more. They vary as much as companies do. Some are top down, some are bottom up. Some run their own insurance and pension plans. Some are craft oriented, like the International Brotherhood of Electrical Workers, and some cover everyone in a plant, like the United Auto Workers.
For the "tech" industry, the Hollywood unions are worth looking at as a model. Most are under the umbrella of IATSE, The International Alliance of Theatrical Stage Employees. The Animation Guild represents most of the animators at the major studios. IATSE has grown over the last decade, which is unusual for unions today. They've picked up many people in Hollywood effects houses. They have not, however, been able to organize the game industry, despite trying.
IATSE figured out the "gig economy" long ago. Their contracts cover things like "minimum call time" (if you're called into work for an emergency, that's not only paid time, there's a minimum number of hours, usually 4), and overtime (not just paid, but time and a half and double time during crunches). This is why, as I've pointed out before, film scheduling is an organized discipline but software development scheduling is a joke.
There are advantages to working at a company with a partly unionized workforce even if you're not in a unionized job. There's less being jerked around. Management is aware that their authority is not unlimited. Hours also tend to be more reasonable.