It's a bit of an in-joke really.
In regards to the camps, there's a belief amongst Americans and people of other nationalities too that the US government is moving to become a dictatorship and/or Obama is going to become President-for-life/Fuhrer/General-Secretary/Anti-christ/Ayatollah [delete as appropriate] of America by use of force, and that anyone who opposes him will end up in a concentration camp run by FEMA.
Here's a link to read:
http://rationalwiki.org/wiki/FEMA_concentration_camps
Here's some conspiracy theories at work:
http://www.subsim.com/radioroom/showthread.php?t=207224
http://www.subsim.com/radioroom/showthread.php?t=205143
http://www.subsim.com/radioroom/showthread.php?t=195804
http://www.subsim.com/radioroom/showthread.php?t=207235
http://www.subsim.com/radioroom/showthread.php?t=202379
http://www.subsim.com/radioroom/showthread.php?t=203587
I think the Nazi Dentists/FEMA Dentists are first referred to here:
http://www.subsim.com/radioroom/show...ts#post1837161
And never forgotten by Tribesman whenever a good conspiracy theory comes up.
Have a read of the links, they're good for a laugh and a cry.