Ukrainian oligarch Firtash linked to Giuliani pals' gas deals and Biden dirt digging
By Tom Winter, Dan De Luce & Ken Dilanian
Giuliani Ukraine associate had checkered past even before indictment
By Darren Samuelsohn & Ben Schreckinger
The Law That Could Take Down Rudy Giuliani
By Casey Michel
Exclusive: Trump lawyer Giuliani was paid $500000 to consult on indicted associate's firm
By Karen Freifeld & Aram Roston