They are still federally protected by the Migratory Bird Treaty Act. You can apply for special permit to shoot them, but they're nigh impossible to obtain. You have to prove that you have gone through all sorts of ridiculous measures to deter them and contain your flock, you have to have absolute proof that it was a hawk, and you have to prove that these deaths are significantly effecting your livelihood (not many backyard chicken keepers can say that they EVER make any money off of their birds). I was recently going through some old family photos from the 30s-40s. In one of the photos, there were two small children (younger than 5) holding what, at first, appeared to be dead chickens. Upon closer inspection, they were hawks and the children were playing with them. I was simultaneously horrified and a bit jealous. lol