However, one organisation which one would hope wouldn't be out to steal work is the Police force; upholders of the law. Well, alas Essex Police have done just that by organising their own photography competition.
The really worrying parts are the terms and conditions. I would suggest you carefully read points 14 to 17. Not only are you giving away rights for three years of your work (amateur or professional) to be used in any way they see fit (including international), but also agree that they may use your image and edit it or combine it with other images!
This really is a disgrace.