Just what is labor's "fair share"?  Did labor assume ANY of the financial risk?  Did labor provide capital to start or even to run a business?  Does labor assume the responsibilities of an investor or business owner?  Which one of those McDonalds employees borrowed the nearly half-a-million dollars needed to start that new franchise?  
Labor's fair share is the agreed upon wage it accepted when it took the job.

The free market is the engine that drives capitalism.  It certainly doesn't drive socialism.  Punishing the successful because they are successful and others aren't,  is in no way "fair", nor does it promote prosperity for either the rich or poor.  How many starter jobs are being replaced by automated systems because of all this faux fairness?
Socialism always fails.  In some cases it may take longer than others, but eventually socialism deteriorates into dictatorial rule and genuine injustice.  But I guess you're OK with that as long as everyone is equally poor?