Anyone can know my entire organization's salary.
As a Public Servant, the salaries of our entire organization are published to the local newspapers' web sites annually. It's a matter of public record. This provides everyone with sort of a baseline, to see whether or not they are making what the rest of the world is making in a particular position. Generally, public service positions are typically lower than commercial salaries around here, but not everyone works for just the money.
A long time back, I worked for a cooperative. Not only did everyone know what each other made, we all had a say in everyone's salary. It was a much more democratic system than any that I have ever worked in. Even though the money wasn't the best, I am kind of sorry I had left. Everyone had a voice on what went on in the co-op. I can't recommend this as a great business model enough.