A searing indictment of Federal Communications Commission Chairman Kevin J. Martin’s actions at the helm of that agency will mark just the beginning of congressional work on the subject, its chief architect said.

House Energy and Commerce Subcommitee on Oversight and Investigations Chairman Bart Stupak , D-Mich, promised both legislative intervention and further investigation of Martin’s management of the powerful telecommunications agency after the release of the report Tuesday.

“There are a number of documents that we’ve requested from the FCC that the general counsel has willfully and purposefully withheld from us,” Stupak said. “We expect to pursue those.”

The report is the product of a year-long bipartisan probe by Energy and Commerce’s investigative staff, which was sparked by allegations that Martin has abused his power as the FCC’s chairman and generally mismanaged the agency.

The report claims Martin has run the agency in a “secretive” and “heavy-handed” manner, which has stoked mistrust among the FCC’s five commissioners and wide dissatisfaction amongst the agency’s staff.

Further, the report claims Martin manipulated, withheld, or suppressed FCC data and reports.

The investigation found the agency’s oversight of certain programs under Martin, such as the Telecommunications Relay Service Fund, to be “lax at best” — potentially wasting $100 million in public funds per year.

The report cites numerous allegations of varying type and severity, including one episode specific to the White House. It claims that in September 2007, a White House official complained to Martin’s office about the White House’s DirecTV subscription, lamenting that the White House did not receive certain local television programming it wanted. In response, the report said, the FCC delayed action on Liberty Media’s acquisition of DirecTV — which had been pending at the time — in an effort to pressure the companies to meet the White House’s subscription demands. They did, quickly, and the transaction went through.