SEICHARANSKY'S LINK TO REPORTERS CITED
regular contacts with Amer reporters emerge as Soviet Govt's main argument to sustain capital charge of treason and espionage against Shcharansky as his trial goes through its 3d day; centerpiece of case against Shcharansky, according to official statements, has been his conveyance of allegedly secret information to unidentified foreign reporter ‘who cooperated with mil intelligence service of a capitalist state’; defendant's bro Leonid says Robert C Toth of Los Angeles Times had been cited in indictment as agent of CIA; Toth has denied charge (M)