For those of you who don't know, you have to complete an ATF Form 4473 to purchase a firearm. It requires a bit of personal info and denials are common.
I have personally seen this form used to deny small defenseless women, who have zero criminal records, from purchasing a firearm for self defense. And if you get a denial, you receive no explanation at the time. You have to wait for an official letter from the ATF, which is basically a word salad.
So these murderers could be stopped in their tracks TODAY if these lefty organizations did their job. But the ATF and FBI are too busy trying to prove Trump is a Russian mole I guess.