Not sure either, he's sort of the conservative boogeyman in the same way the Koch brothers are for liberals I think. He's also badly disliked in Hungary.
There's an anti-semitic element to it, while on FOX News, Glen Beck
ran a series of exposes on Soros with his
face super-imposed on the Star of David.In terms of politics, Soros' main contribution was in backing pro-democracy groups overthrowing Soviet communist regimes in Eastern Europe. This is characterized in the anti-Soros literature as that he overthrows governments. They leave out that the governments he overthrew were all evil dictatorships. As for the Hungarians, they have a far-right government who are at odds with Soros' continued support of pro-democracy / pro-liberalism international organizations. He's a good scapegoat for their political problems now.
The other big claim is that he "broke" the bank of England. The real story was that the British pound was massively overvalued, but was being propped up for political reasons. Soros realized there was going to be a big devaluation, so he did short-selling (that's where you promise to sell a commodity in the future when you don't have it).
After the devaluation, then the sales came due, and he
then bought British pounds at the deflated price and sold them to the other investors. So ... he cannot have
caused the devaluation, because all of his actual trading occured
after the event.