He collaborated with Mies on New York's finest modern skyscraper, the Seagram Building, before embarking on a series of big buildings of his own that followed the lead of the talented young architects he courted, encouraged and commissioned in a process of patronage and exploitation that kept him creatively alive, borrowing shamelessly from their work for the hedonistic dilettantism that became his personal style.

WSJ: Philip Johnson: Short of Attention Span, Long on Aesthetics

There is plenty of room to debate whether this type of labor amounts to exploitation of, excuse the pun, a captive audience or does it take away jobs from those who are in the general work force.

FORBES: Putting Prisoners To Work