Spector, as I recall, owned his own studio at the time. At that point, it's private property, and there's nothing wrong with enforcing those property rights.
So he could just hold people at gunpoint for whatever reason he felt like, as long as it was his property?
Spector is a stupid crazy asshole who needs a stint in a mental hospital, but sadly won't get one. And what he did as previously mentioned is the tip of the iceberg.
In 1990, at the Rock & Roll Hall Of Fame induction ceremonies, when he was supposed to induct The Platters, he instead rambled on about the Panama invasion, bitched about rap music, insulted M.C. Hammer for not using the word 'Revue' made a tribute to Elvis, and then thanked himself as the Platters. He did this again in 1991 as well. This clown needs to get some mental help, as I've said before, as well as a good supply of meds.