It would be legal for a PAC to sue someone and pay for it out of its own funds. But like
@reptile baht spaniard rid said, it would be illegal for Greer to represent a PAC (or any corporate entity)
pro se.
It would be legal for Greer to sue someone
pro se and pay for it out of his own bank account. But then the
Greer vs Moon judges will ask why he keeps pleading poverty about the $80. Greer's bullshit excuse so far is that he is totally complying, but he keeps filing requests for reconsideration, extensions, clarifications, etc, and he's just waiting for "clarification" to proceed.
It would
sometimes be legal for the PAC to incur an expense, and Greer to pay for it out of his personal funds. But he would need to record that as a contribution, the PAC would need to do accounting and reporting, etc. (I don't know the specific requirements, just the general rule.)
It would
likely not be legal for Greer to sue someone and the PAC to pay his fees. There may be a way to structure it properly, but a PAC shouldn't directly be paying for personal expenses.
It would
definitely not be legal for Greer to incur a personal expense somewhere, and the PAC to pay for it out of their separate funds. That includes rent, whores, and document retrieval fees in copyright lawsuits.
It would be
extremely and hilariously illegal for Greer and his PAC to share funds in a single bank account, paying for anything that comes up in either realm, without any attempt at segregation or accounting. From the filings in
Greer v Moon, and the paperwork we've seen on his LLCs, it sounds like this might be what he's been doing.