Blumenthal said his clients continue to endure threats and harassment from people who believe Jones.
"They face people following them, coming to their town, videotaping them and their children, defacing memorials to their children, contacting them demanding they exhume their children," he said. "It is really some of the most outrageous harassment and abuse you can imagine."
The lawsuit, filed Wednesday in Connecticut state court, lists Jones and Infowars as defendants, along with a handful of other people and businesses Blumenthal claimed syndicated and profited from Jones' statements about the shooting.
Two of those companies are Burnsville, Minn.-based Genesis Communications Network Inc. and Midas Resources Inc. — both privately owned by Ted Anderson.
The lawsuit alleges Anderson, the head of Genesis — a talk radio syndicator — appeared many times on Jones' show to promote his other business, Midas Resources, which has sold precious metals and dietary supplements over the years.
Blumenthal said his clients hope suing Jones and the other defendants will finally put the conspiracy theory to rest, and free them from any further harassment.
"It's about accountability for the actions of these defendants who have waged this campaign of outrageous and malicious lies against people who have suffered a really fathomless loss, and they've done it in order to profit off of the audience that they increase through spreading these conspiracy theories," he said.
Messages left for Anderson by phone and at his office by MPR News were not returned as of Thursday evening.
