The family of a Newton native who was killed in 2006 by a Hezbollah rocket fired into Israel has filed suit in federal court in Boston against Iran and three banks for funding the terrorist group.

In a lawsuit filed Monday, lawyers for the family of David M. Lelchook argue that Iran, its Central Bank, Bank Saderat Iran and Bank Saderat, PLC, in the United Kingdom, each “provided Hezbollah with material support and resources … that enabled, facilitated and caused” the rocket attack that killed Lelchook as he was riding his bicycle toward a bomb shelter in northern Israel.

“Hezbollah is a proxy of Iran, which is up to ever more mischief,” said Robert J. Tolchin, one of two Brooklyn attorneys representing the Lelchook family. “David Lelchook was a 52-year-old man with another lifetime ahead of him, and that’s been taken away from him by a random missile. They call that war? They call that the way a nation behaves?”

Tolchin and his co-counsel, Marna F. Berkman, filed suit under the Foreign Sovereign Immunities Act of 1976, which bars foreign countries from being sued in U.S. courts, except under certain circumstances, such as if they sponsor terrorism.

But a lawyer who represented Terry Anderson, the Associated Press reporter who was taken hostage in 1985 by Hezbollah and held until 1991, said winning will not be the challenging part of the case.

“Collecting on the judgment will be,” said Stuart Newberger , who won Anderson’s suit against the Iranian government and helped convince Congress to pass a law that allowed them to tap into frozen Iranian assets.

Tolchin blasted the Obama administration’s nuclear deal, which promises to return to Iran billions of dollars in assets that were frozen years ago.

“We do feel strongly that before any money is released to Iran, Iran should have to pay” money that the families of terror victims have won in court, he said.

That money is estimated at a total of more than $12 billion, Newberger said.

“But the nuclear sanctions against Iran only related to nuclear issues, not terrorism issues,” Newberger said. “It’s apples and oranges.”