U.S. AGAIN COMMENTS ON SOVIET DISSIDENT
US State Dept informs USSR of its concern over Ginzburg case; interest was conveyed on Feb 4 to Amb Dobrynin by State Sec Vance; Vance also asked Russians to rescind expulsion of AP correspondent George A Krimsky; Moscow refused and Washington expelled Soviet reporter in retaliation; Soviet Embassy calls expulsion âabsolutely groundlessâ and violation of Helsinki agreement; USSR reptdly wants to move energetically toward new arms-control accords, but Carter Adm reptdly wants Soviets to understand that US will not remain indifferent to human rights violations (M)