Leftwing, IMO.
They typical leftist counterargument to this is to claim that he abolished unions. Actually he didn't, he replaced the
independent labour unions with a single nationalized labour union that all Germans workers were part of, the German Labour Front.
http://en.wikipedia.org/wiki/German_Labour_FrontSince independent labour unions were also abolished by the Soviet Union, Cuba, North Korea, communist China etc., I don't think this disqualifies Hitler from being considered economically left wing. Nor does the militarist emphasis of his economic policies disqualify him seeing as the USSR and FDR's America pursued similar military buildups.