TNR programs and feral cat colony proposals in Alaska need to be given a resounding No. If you want to reduce such populations, work with local government and veterinary clinics and come up with some type of reduced cost or Free spay-neuter program. Recruit businesses to volunteer something small as an incentive to people who use the service, like a free second scoop of icecream at a local shop if you purchase the first one. A 2$ off coupon at a local carwash. A free cookie or 1/2 off a large can of kitty treats. There are organizations that care for pets all over Anchorage, they could get together and run a raffle, everyone who takes advantage of the clinic to get their pets 'fixed' is entered to win. Any one or all of these ideas is better than a feral cat colony being fostered in Anchorage. We have enough  predators of the two-legged kind, we don't need even more (albeit smaller) predators in Anchorage.