Yeeeeeaaaaaaaahhhhhhhhhhhh. That goes so far beyond violating the 5th Amendment "Takings Clause" that it even goes beyond Fascism and into Leninism-Stalinism. Whatever FDR's private opinions about nationalization, he didn't have Electric Boat, Kaiser, Boeing, Grumman, Douglas, Convair, Ford, Chrysler, GM, Willys, etc. nationalized.