The same as any socialist: he wanted to force the American people/society/economy to conform to his whims, while hiding his own weaknesses. That's why he made every effort to hide his polio-ruined legs and, even in the 1944 election campaign, pretend that he was healthy. Ironically, his efforts to appear healthy to the American people ended up giving him the pneumonia infection that would soon claim his life, when he took long rides in an open-air convertible car during a cold snap (segmented by stops in heated garages to try to warm himself back up).