Barbara Curley stands next to photos of her son, Jeffrey Curley, at her home in Cambridge, Mass., in 1998. Jeffrey was kidnapped and killed in October 1997. BOSTON — A group that promotes sex between men and boys asked a federal judge yesterday to dismiss a lawsuit brought by the parents of 10-year-old Jeffrey Curley, who was murdered by one of the group's members. Curley was killed on Oct. 1, 1997. Salvatore Sicari, of Cambridge, was convicted of first-degree murder in the case, while Charles Jaynes, of Brockton and Manchester, N.H., was convicted of second-degree murder and kidnapping. Last...