DALLAS (AP) — A millionaire builder, a restaurant owner, two licemen and the h usband of Maureen Dean, wife of former White House counsel John Dean, have been called before a federal grand jury here probing mbling connections tween Dallas and Las Vegas. The long-running __in vestigation reportedly in volves questions of whether syndicate money is backing high voltage gambling operations in Dallas and throughout North Texas. Subpoenas have been issued to Joseph Campisi, owner of a popular Dallas eating establishment; wealthy builder James L. Williams; George Owen, former executive with the New Orleans Saints and Dallas Cowboys football team; and city detectives Jerry Curtis and Roy E. Vaughn. Owen was once married to blonde beauty Maureen Dean who attracted at tention during her husband's televised testimony before the Senate Watergate In vestigating Committee last summer. The two peace officers were assigned in 1972 to listen to telephone con versations tape recorded by the FBI in an effort to identify any policemen who may have been dealing with bookmakers. The FBI used the tapes to haul in Dallas area men in January 1972 on gambling charges but the case was dropped when federal agents refused to divulge the names of their informants. At the time, admitted gambler Bobby Joe Chap man lamented that ‘you cross a_ state line into Nevada and we're all treated like gentlemen but down here we're the scum of the earth.” During their raids the FBI had seized an envelope marked “Dallas Cowboys Football Club’’ containing $10,000. The money was returned to Chapman when the charges against the group were dismissed.