Haldol is a typical antipsychotic. If the patient has no symptoms that indicate its use, they should absolutely not be taking it. There's a lot of side effects. Some may even persist after the medication is discontinued.
One of these side effects is that it can be sedating. I've been on the patient side of a misapplied antipsychotic myself. They can make you very tired and cause you to feel "drugged". This is not the same as a drug being a "powerful sedative". Words mean things. Words in a medical context have specific definitions and nuance. If you're reporting on medical malpractice, it's important to get the vocabulary correct so that the way you word something represents the truth rather than a sensationalized version of it.
I can definitely believe that these people were medicated in ways that were dangerous to their health for the convenience of the staff. However, when you call Haldol a powerful sedative, I have to assume you're either trying to make the situation sound as horrible as possible or you have no idea what you're talking about.