Grisly Crimes Described by Prosecutors as Mob Trial Opens
Trial of Joseph C Massino, alleged mob boss, opens in federal court in Brooklyn with prosecutor describing seven grisly murders that he is accused of committing; defense lawyer focuses on often-confusing stories behind murders and criminal histories of seven Bonanno turncoats set to testify against Massino; Anthony L Giliberti, ex-Teamsters local official, testifies that Massino threatened to kill him in 1982 just before someone tried to kill him with nine shots; fails to identify Massino in court (M)
