Pecking order has to play out.
normally, new chickens are introduced to the existing flock over the course of several days or a couple of weeks. You have to physically separate the new from the old, but be able to interactwith each other. So, a fence or a large dog cage, etc.
If it is just old chickens reprimanding the new, and no blood, then they will figure it out. When blood is drawn, you will need to separate them. The old ones can kill the new ones.
add another feeder and waterer, as the old ones can keep the new ones from eating and drinking. When you add the extra feeder snd waterer, you need to put it in a different location that the existing ones.