Mark Lewis, the lawyer who has led the attack on hacking cases in the UK, has teamed with two New York law firms to represent at least four people, including one U.S. citizen, who may have had their privacy violated here by Rupert Murdoch-owned properties. If they decide to pursue the matter “I believe it will be taken seriously” by U.S. courts, one of the lawyers — Norman Siegel of Siegel Teitelbaum & Evans — said in a meeting with reporters today. “These are serious issues.” Steven Hyman of McLaughlin & Stern is co-counsel. Lewis says the clients believe that their phones were hacked on U.S. soil between 2001 and 2006, and are named in notes of Glenn Mulcaire, the UK private investigator who cracked into people’s voicemail accounts for the Murdoch tabloid News Of The World. While the lawyers wouldn’t go into detail about their clients or plans, Lewis says that having U.S. lawyers may make it easier to question News Corp deputy COO James Murdoch, who recently moved to New York. “It becomes relevant to all sorts of issues,” he says. Lewis adds that none of the U.S. clients have cases in the UK that might be compromised by actions here.