FWIW, I too am pro-union but have also seen issues at the K-12 level. Some are even well intentioned. Example: schools would cut their more senior teachers to

FWIW, I too am pro-union but have also seen issues at the K-12 level. Some are even well intentioned. Example: schools would cut their more senior teachers to save money (because they had the highest salaries). So the unions made contracts that protect seniority. Which means if the longer you survive, the safer your job without respect to your quality. Experienced quality teachers are impossible to match...but experienced jaded teachers are easier to find (it is grueling to try and improve students away from dumb mistakes before you can even teach your material, only to start from scratch semester after semester.) Standardized testing attempts to fix this, but....let's just say the math teachers (or anyone with an understanding of statistics) did not get a say in how they are used. Teachers that get a "bad class" (higher number of poor or unwilling learners) face serious impacts to their career success.