Bursor & Fisher, P.A., a New York-based law firm with a history of taking on telecoms, has launched Fight The Merger, an initiative opposing the proposed $39 billion merger between AT&T and T-Mobile. Merger opponents argue that a successful block of the merger will prevent a duopoly between AT&T and Verizon, and preserve competition in the wireless market.

Bursor & Fisher—which has represented customers in cases against both AT&T and T-Mobile in the past—has signed up a few dozen AT&T customers to oppose the unpopular merger. The Fight The Merger site notes that a successful takeover would leave AT&T and Verizon controlling 80 percent of the market, which it argues would result in hindered innovation and little consumer protection from high prices. Sprint, which has struggled lately, would be the only nationwide competition to AT&T and Verizon, and it has vocally opposed the merger.

Bursor & Fisher will attempt to thwart the merger through arbitration via the Clayton Antitrust Act. The law firm interprets the Act as allowing those who would be affected by a merger with monopolistic implication to prevent the merger from being completed. Bursor & Fisher is confident in its ability to use AT&T’s own Arbitration Agreement to stop the merger, despite a customer agreement that keeps individual customers from suing AT&T. If AT&T does not cease and desist within 30 days, Bursor & Fisher will file a demand for arbitration with the American Arbitration Association.

AT&T has dismissed Fight The Merger. “The claims made by the Bursor & Fisher Law Firm are completely without merit," an AT&T spokesperson told Ars. "An arbitrator has no authority to block the merger or affect the merger process in any way. Our arbitration provision allows customers to resolve their individual disputes with AT&T in a prompt and consumer-friendly manner.”

AT&T also made its merger plans available to the public. As the company indicated in its second-quarter earnings call last week, the telecom believes the merger remains on track for regulatory approval.

Bursor & Fisher is no stranger to the wireless industry, having represented customers of Verizon, AT&T, Cingular, Sprint and T-Mobile in past legal actions. Victories include a $299 million verdict against Sprint in 2008, representing 1.9 million Californians charged with early termination fees.

Only AT&T Wireless account holders with a billing address in the United States are eligible to sign up with Fight The Merger.