Monday's big Jamaica Plain news, that police and prosecutors had arrested much of the leadership of the Boylston Street gang, may come as a relief to neighbors who have lived in fear. Over the years, the Boylston associates often had bloody conflicts with their rival Mozart Street gang. Police stress that while the names of the groups come from two JP streets, the feuding gang members no longer live there. Here is a review of violent incidents police have linked to the conflict between Boylston and Mozart: April 2008: Luis "Mata" Troncoso, 20, an alleged Boylston Street associate, shot and killed on the basketball court near Stony Brook T. October 2008: Garivaldis Peña killed in a shooting on Rossmore Street. August 2010: Two nonfatal shootings in Eglston Square, according to the JP Gazette. Oct. 23, 2010: Boylston Street gang member Luis "Tito" Torres mortally wounded by gunfire on Boylston Street Nov. 21, 2010: Three men mortally wounded in a gun and knife fight inside Same Old Place on Centre Street. Killed were Winsizky Soto, 27 and Johnnel "Bo" Cruz, 20, of Jamaica Plain and Ariel Dume, 20, of Dorchester. A woman going past on Centre Street was grazed by a bullet. November 2010: Amin Marte of the Mozart Street gang killed in the Dominican Republic, according to an affidavit referenced by the JP Gazette. December 2010: Members of the Mozart Street gang practice shooting at a Salisbury gun range. According to the Gazette, police and prosecutors link at least two other homicides and many drug-related crimes to the rival groups.