So, when company, factory owner, or who sell service/good get together, and talk how much they will charge consumer, it is price fixing.
So, I just thinking, worker are those who sell larbor. Worker band together, which we call worker union, to decide how much they should ask from their employer, seem similar to price fixing.
Price fixing doesn’t mean setting a fair or reasonable price for your product. Price fixing is the - usually - illegal practice of artificially raising your product’s price by means of market manipulation or similar. Union wage negotiations are more a form of collective bargaining.