Which committee decides exactly how many million dollars a man is allowed to make in his lifetime? I nominate Hugo Chavez for chairperson; he's an international expert on these affairs and surely the Venezuelan economy's current state of double-digit inflation and economic contraction in all sectors (except for oil) are completely unrelated to his confiscatory policies. ;)

The people who already do this are called the government. They do this by setting taxes. Reducing salary inequality would be a simple case of raising and setting the right taxes and closing the relevant loopholes.