Parasites

The credit system, which has its focal point in the allegedly national banks and the big money-lenders and usurers that surround them, is one enormous centralization and gives this class of parasites a fabulous power not only to decimate the industrial capitalists periodically but also to interfere in actual production in the most dangerous manner—and this crew know nothing of production and have nothing at all to do with it.  ~  Karl Marx, Capital, vol. 3, chap. 33