File on Help by U. S. Officials To Slav Congress Held 'Lost'; RED INQUIRY FILE REPORTED 'LOST'
Cvetic continues testimony; says file on Amer Slav Cong, orgn listed as subversive, showing Cong members and notables, including P V McNutt and late Pres Roosevelt, who aided orgn, is missing; says S Milgrom is 'real' head of Communist party