It seems Maria overheard him arguing on the phone with one of his ' cleaners' about being paid to kill someone.
She nervously explains that she's only been working in the accounts receivable department at the Di Napoli Waste Removal dump a couple of months, and that her boss, 'Puppy' Paul Simmons, has been dumping waste in the bay and extorting drivers from other garbage companies. Lincoln goes to see Maria Bava, who needs someone with his skills to help her out. They decide to start by looking into his industrial waste operation. Donovan figures that because Enzo isn't a big fan of the casino project, thinking anyone who's not Sal Marcano is going to end up getting screwed, they might be able to flip him to their side. Because Marcano's a felon, he must have a partner who's legit to funnel the money and buy all the equipment.
All the heavy construction equipment and supplies for Marcano's new casino are brought in via Enzo's trains. He started off extorting the railroads and then moved into industrial waste. Donovan fills Lincoln in on Enzo Conti, an old-school mob man who's run Barclay Mills for decades.
