Oh dear! I've spent ages trying to find the link, however - it was circulating that council special officers (ie traffic wardens etc) were being given black uniforms, and special powers to arrest/search people, even to be able to go into their homes. They have no police training, but have been issued with cards. One recipient, who asked what was going on was told to keep it quiet, but riots etc were being predicted very soon.
I haven't heard or seen any evidence of FEMA type camps here though.
The potential for higher crime levels in the instance of food/money shortages due to financial crash is to be expected, especially in the cities.
Therefore, be prepared and stock up on dried foods/veggies etc. At least they will always be useful. Dried pet food also.