Pirates still trolling the meeting seas

According to a post recently on the MeCo listserv, it looks like the housing pirates are still alive and well. You know, the folks who find your exhibitor and/or attendee list and try to market rooms to them for your show, sometimes posing as the actual show organizer, sometimes saying things like the block is sold out (whether or not it actually is) and offering rooms at hotels both inside and outside the organizer's blocked facilities. Can anyone say attrition?

If you run into this, this article, though I wrote it a while ago, may have some tips on how to deal with pirates who try to raid your attendee block.