Which '70s Action Star Did Brian Grazer Witness Hosting A 100-Person Orgy?

I’ve heard plenty of contemporary stories from Hollywood assistants and gofers about having to deliver dubious packages (mostly cocaine) to industry big wigs, so I can only imagine what it was like in the ’70s. A time when debauchery reigned and the unprotected sex flowed like wine! (Or so my favorite movies would have me believe).