Roosevelt and the Great Depression

I was amused to see Conrad Black writing with shock:

Jim Powell of the Cato Institute (cited approvingly in a recent column by Robert L. Bartley) argues in a new book that FDR actually prolonged the Depression!

Of course, Powell is correct. Imagine, increasing the power of unions to strike and raise wages during a time of mass strikes and mass unemployment. Imagine thinking that cartelizing whole industries thereby raising prices and reducing output could improve the economy. Not everything Roosevelt did was counterproductive - he did end prohibition (although in order to raise taxes) - but plenty was and worst of all was the uncertainty created by Roosevelt's vicious attacks on business. (See, for example, the work of Bob Higgs especially this important paper and historian Gary Dean Best's overlooked classic Pride, Prejudice and Politics.) Business investment failed to recover because business people legitimately feared a regime change like that which had occured in Germany and Italy. Sound extreme? Roosevelt himself threatened/promised this in his first inaugural:

...if we are to go forward, we must move as a trained and loyal army willing to sacrifice for the good of a common discipline, because without such discipline no progress is made, no leadership becomes effective. We are, I know, ready and willing to submit our lives and property to such discipline, because it makes possible a leadership which aims at a larger good... I assume unhesitatingly the leadership of this great army of our people dedicated to a disciplined attack upon our common problems....in the event that the Congress shall fail to take one of these two courses, and in the event that the national emergency is still critical, I shall not evade the clear course of duty that will then confront me. I shall ask the Congress for... the power that would be given to me if we were in fact invaded by a foreign foe.