I.R.S. SAID TO BALK INQUIRY ON REBOZO
Terry F Lenzner, asst chief counsel to Sen Watergate com, sends 9-page rept to com charging IRS with obstructing inquiry into Howard Hughes' $100,000 cash contribution to Pres Nixon; accuses IRS of defying Sen resolution by refusing to provide tax returns and other data requested by com; suggests IRS is bowing to wishes of White House; closely involved sources suggest IRS has participated in 'whole other cover-up' of tremendous dimensions; Sen inquiry into contribution became more intense after Pres Nixon's former personal atty Herbert W Kalmbach testified in Mar '74 that Charles G Rebozo, who claims Hughes' donation was kept, untouched, in safe deposit box, actually 'used' money to make payments or loans to Pres Nixon's 2 bros and his personal sec Rose Mary Woods; Rebozo said in int with Miami Herald in fall of '73 that IRS had cleared him of wrongdoing after 12-week investigation ended that summer; Lenzner's rept lists following questionable activity by IRS: that it did not int Rebozo about Hughes money for almost full yr after learning of it; that Rebozo was advised, via White House, of IRS's interest in matter before IRS contacted him; that all IRS material in case was routinely forwarded to John D Ehrlichman, who relayed information to Rebozo; that IRS agent John Bartlett, assigned to Rebozo case, began his interrogation of witnesses by asking for ints through Rebozo's atty Kenneth Gemmill; that Bartlett told Rebozo that then-Watergate special prosecutor Archibald Cox was given Rebozo's IRS file; Lenzner accuses IRS of putting 'frustrating and debilitating roadblocks' in com's path by refusing to provide it with agreed-upon documents, including copies of 'sensitive' repts on Hughes Tool Co, Rebozo and others (L)