An ugly feud between two actors unions burst into the open Monday, with the American Federation of Television & Radio Artists accusing its sister union of breaching a 26-year-old bargaining agreement. AFTRA and the larger Screen Actors Guild have been jointly negotiating contracts under a so-called Phase 1 Agreement adopted in 1981. But that solidarity threatened to unravel Monday when AFTRA National President Roberta Reardon blasted a decision by the SAG board to change the way votes are counted on a joint negotiating committee. Richard Verrier reports.