During the 1932 presidential campaign, Roosevelt simply adored mocking Hoover for his numerous "little committees", each one set apart from the next by a different set of letters; [Hoover] "had more than forty such commissions and committees. But since the coming of the New Deal that record has been laid in the shade. While criticizing the Republican 'commissions' the Democrats undoubtedly did not foresee at that time that more than 60 new government agencies, commissions and committees would spring up to guide the new deal. All these agencies have, of course, increased the number of Federal employees. In fact they have added nearly 100,000 persons to the Federal payroll..."
Click here to read about an agency not mentioned here: the National Youth Administration...
More on the Alphabet Agencies can be read here...