A more intriguing question is to what end might you employ two or three hundred million people? Imagine they are sitting outside your window waiting for your command. Assuming you are paying them a living wage, what economic output could they accomplish that would be "worth" say 5 to 15 trillion dollars a year?
A good thought experiment! My initial thought was a spiritual successor to WPA-like projects of the depression, but I'm not very well-read on the economic outcomes. My layman view at least sees the humanitarian and creative output of such projects.
But your last sentence is key: would it be "worth" 5-15 trillion/year? Is there a way to "measure" such a number of WPA-like projects?
And in the end, if every fat cat has to "bring the work home" then they all just raise their prices. Its not the 1% that get hurt; its all the rest of us.