Longtime Paramount Global shareholder Mario Gabelli, who had agitated against iterations of the Skydance-Paramount merger deal, is stepping up his campaign for more transparency around the deal. Lawyers for Gabelli,

The letter comes after the GAMCO Investors Inc. chairman filed a books and records request seeking more specifics about the $8 billion merger deal

The FCC filing follows legal maneuvering from Mario Gabelli, the largest holder of nonvoting shares, seeking access to Paramount's books.