A gang of inbred, cross dressing, white supremacists weak in mind and body. They are easily recognized by the pointed (to conform to their pinheads) pillowcases that they use as headgear and the white dresses that they wear.
No one has determined exactly why they hide their faces behind hoods. It is likely that this disguises their horrid (due to inbreeding) appearance or because they are so weak and scared that they don't want to be identified by anyone over the age of four that might kick their ass.
Why look, it must be the halloween meeting of the Southern Cross Dressers Society. Sorry, I was wrong, it's just a klan rally. What has 5 teeth and an IQ of 73? The first 3 rows at a klan meeting.