Believe it or not, but here in these great Unites States Congress passed just that measure in 1930s, raising the top marginal income-tax rate to 100%. Apparently on advice of Morgenthau, Roosevelt decreased it to... 90%.
It did not occur to our elected representatives that nobody would work passed the threshold if all his income is to be forfeited.
I vote for cloning Mellon as Treasury Sec.