Just googled this up...
The Revenue Act of 1932 was the first tax law passed during the Great Depression (Revenue Acts, June 6, 1932, ch. 209, 47 Stat. 169). It increased the individual maximum rate from 25 to 63 percent, and reduced personal exemptions from $1,500 to $1,000 for single persons, and from $3,500 to $2,500 for married couples. The National Industrial Recovery Act of 1933 (NIRA), part of President Franklin D. Roosevelt's New Deal, imposed a five percent excise tax on dividend receipts, imposed a capital stock tax and an excess profits tax, and suspended all deductions for losses (June 16, 1933, ch. 90, 48 Stat. 195). The repeal in 1933 of the Eighteenth Amendment, which had prohibited the manufacture and sale of alcohol, brought in an estimated $90 million in new liquor taxes in 1934. The Social Security Act of 1935 provided for a wage tax, half to be paid by the employee and half by the employer, to establish a federal retirement fund (Old Age Pension Act, Aug. 14, 1935, ch. 531, 49 Stat. 620).
The Wealth Tax Act, also known as the Revenue Act of 1935, increased the maximum tax rate to 79 percent, the Revenue Acts of 1940 and 1941 increased it to 81 percent, the Revenue Act of 1942 raised it to 88 percent, and the Individual Income Tax Act of 1944 raised the individual maximum rate to 94 percent.
http://www.wld.com/conbus/weal/winctax1.htmBTW - this 100% taxation fantasy mentions that FDR issued an Executive Order mandating this. This is not constitutionally possible. Only Congress has the power to tax on the Federal level.
Here's what he actually said:
At the same time, while the number of individual Americans affected is small, discrepancies between low personal incomes and very high personal incomes should be lessened; and I therefore believe that in time of this grave national danger, when all excess income should go to win the war, no American citizen ought to have a net income, after he has paid his taxes, of more than $25,000 a year. It is indefensible that those who enjoy large incomes from State and local securities should be immune from taxation while we are at war. Interest on such securities should be subject at least to surtaxes.
I earnestly hope that the Congress will pass a new tax bill at the earliest moment possible. Such action is imperative in the comprehensive all-out effort to keep the cost of living down-and time is of the essence.
(Message to Congress on an Economic Stabilization Program April 27, 1942)
http://www.presidency.ucsb.edu/site/docs/pppus.php?admin=032&year=1942&id=48