Officials with the New Jersey attorney general's office said on Monday that the state had agreed to a $400,000 settlement in a lawsuit filed by a former state trooper who said that he was beaten and harassed by members of a secret group of rogue officers within the State Police. The former trooper, Justin Hopson, filed the lawsuit in 2003. In it, he described a series of beatings, threats and acts of vandalism that he said occurred after he refused to support an arrest by another trooper in 2002. Mr. Hopson said that he was attacked by members of a loose-knit group within the State Police known as the Lords of Discipline. For years, minority and female troopers have complained that they have been harassed by members of the group. In 2005, the state attorney general's office issued a report that found seven troopers guilty of harassing their colleagues. The troopers received punishments ranging from reprimands to 45-day suspensions. Mr. Hopson, 33, filed suit after the March 2002 arrest of a woman for drunken driving, which he said was improper because the woman had not been behind the wheel. When Mr. Hopson refused to endorse fellow troopers' versions of events surrounding the arrest, court papers said, a campaign to silence him began. First, there were threatening notes left around his station house. Then, Mr. Hopson said, his car was vandalized. By the time he sued the state in December 2003, Mr. Hopson said that he had been the victim of a series of beatings at the hands of another trooper.