I'm trying to make a command to kill the boss I made and all of it's minions, it's name is &9&lBanished Soul and it's minions name is &3&lGhoul, they're all zombies, here's what I got so far, nothing works

command /killboss:
trigger:
kill all zombies named "&9&lBanished Soul"
kill all zombies named "&3&lGhoul"

Thanks for helping me