Mafia Said to Have Slain Rosselli Because of His Senate Testimony
Rosselli, John (?-1976): 2 men known to have personal knowledge of murder of reputed organized crime figure John Rosselli provide information that he was killed by members of underworld as direct result of his testimony before Sen Intelligence Com concerning his participation in CIA plots to kill Cuban Premier Fidel Castro; both have provided details about murder that are strongly supported by physical evidence uncovered in extensive investigation by NY Times; account of Rosselli's murder noted; different theories concerning his death discussed; illus (L)