I've never been a union member.
But, I worked for a company for many years that had unions and every time the union got an increae of some kind, we so called "professional staffers" also got a bump.
So yes, I think unions are necessary and the threat of an organized workforce is the only thing that keeps unscrupulous employers in line.
You realize that the industries that saw the highest wages paid during the heyday of unions, the 1950s/1960s, are also the ones that experienced the largest number of layoffs and closings, right?
What good is it to workers if they negotiate outsized wages and benefits, only to see their industry get hammered and downsize and/or close?