Well, not exactly.

He mentioned that Derek Hay left him "threatening messages" on his answering machine in one of the first casts.
If there's any truth to this at all, it's probably because he casually calls Derek Hay and Mark Spiegler pimps and means the profession encompassing video whoring, legally troublesome travel whoring (Dirty Dubai, behavioural reprogramming at Kink) and classic whoring.
Common generalisation provided ("messages"), he might actually have done it. Black was going on how fucking riduculously stupid it'd be to leave someone under federal investigation a message like that.

The offices of World Modeling, I think it was, are supposed to smell like cum, by the way, with three rooms of whores and some accounting in another one or so.

Zoltar Hay. Derek Hay. He switched mid-rant in the latest show linked to above.