From Wiki's entry on Mises:
the Southern Poverty Law Center alleges the Mises Institute to be a Neo-confederate organization, though its application of this term is controversial.In my view, this kind of charge is merely the result of an excess of political correctness run amok. The politically-correct and liberal types often hypocritically excuse or whitewash the genocides and mass murders committed during the twentieth century by governments they would otherwise view as benevolent. Charges of Neo-confederacy and the like fly in the face of the tremendous amount of anti-socialist and anti-Fascist writing on the Institute's website and demonstrated in their programs, e.g. seminars such as the The Economics of Fascism.
I have edited the Wiki entry a bit; others may be interested in correcting the entry (or massaging my own comments as noted above) but should do so from a neutral point of view only.
The Wiki entry may link to this very post, so feel free to post comments below criticizing groups like SPLC who would make such ridiculous allegations.