I read the book and this was one position I found indefensible. Employees must have the ability to move companies, and any attempt to block it is bad and immora

I read the book and this was one position I found indefensible. Employees must have the ability to move companies, and any attempt to block it is bad and immoral. If an employee of any of my friends applied we would absolutely consider them and give them an offer, over any objections their old boss had.