Ibragim Todashev, 27, was shot dead by a member of the task force during an interrogation at his home in May. A Florida prosecutor and the Justice Department cleared the FBI agent who shot Todashev of criminal wrongdoing. Redacted documents about the incident were released in March, which the ACLU states provided more questions than answers.
The 14-page lawsuit states, "The federal government's collaboration with Massachusetts state and local police, especially through the (task force) has for years been shrouded in secrecy. The Massachusetts (task force) conducts hundreds of investigations in Massachusetts every year. Yet little is known about their structure and function."
Members of the task unit were questioning Todashev about his relationship with Tamerlan Tsarnaev, the deceased suspected marathon bomber, when he was shot. Todashev allegedly confessed that he and Tsarnaev were involved in the triple Waltham slaying in 2011.
The lawsuit states, "When law enforcement officials kill someone in his own home, the public deserves to know who was there, why and under what authority."
A message was left at the US attorney's office in Boston. The FBI declined to comment.