Your definition of a "free labor market" is a contradiction in terms. A free labor market is one where people are free to exchange their labor (collusion), not one where a third party decides who gets to exchange what labor and for how much.
Laws against hiring and pricing agreements are interventions in the market. Laws against hiring agreements are not consistent with a free market.
There's nothing wrong with people (employers) making agreements with other people (employers) regarding the things they own (their money).
Laws against hiring and pricing agreements are interventions in the market. Laws against hiring agreements are not consistent with a free market.
There's nothing wrong with people (employers) making agreements with other people (employers) regarding the things they own (their money).