May 28, 1992

In hours of testimony on how a New York-based crime organization used murder as a managerial technique, its former boss described in brutal detail yesterday the extent to which the crime family would go to silence "rats" and rivals within its ranks. In his second day on the stand, Alphonse D'Arco told the United States District Court in Brooklyn that "whacking" fellow crime family members, even graying ones who spent a lifetime being loyal to the organization, was commonplace in the underworld he inhabited most of his life. In one case, a canary was stuffed into a murder victim's mouth as a warning to potential informers.

LOOKING FOR TOMORROW'S BETTORS The generation of bettors who regularly visit tracks is aging, and track operators say too few young horse players are showing up to take their places along the rail. B6. NEW YORK CITY MANAGEMENT BY MURDER

To see some of the country's most impressive and delightful advertising, buy a ticket -- not to a museum or a gallery, but to a ball game. Baseball, architecture and design fans have been crowing over Oriole Park at Camden Yards, home of the Baltimore Orioles, since the $105.4 million stadium opened last month. Simultaneously modern and traditional, it blends elements of baseball's rich past with contemporary features in a fashion that almost prompts visitors to sing "Everything Old Is New Again" rather than "Take Me Out to the Ball Game."

European Community governments imposed a partial trade embargo on Serbia and Montenegro today and called on the United Nations to go further and ban oil sales in its own economic sanctions in the hope of forcing an end to Serbian intervention in Bosnia and Herzegovina. Their move came just three days after they were publicly admonished by Secretary of State James A. Baker 3d for moving slowly to tackle what he called the "humanitarian nightmare" gripping the former Yugoslav republic since it declared its independence from Belgrade three months ago.

Plagued by conflict and delays, the $14.7 billion English Channel tunnel project has degenerated from a grand symbol of European business integration to a financial morass, with one of the leading contractors suggesting this week that the project could face bankruptcy. The "chunnel," as the 24-mile-long underwater link between Britain and France is sometimes called, was once scheduled to open on June 15 next year. That has been postponed to the last quarter of 1993 at the earliest and may well be put off until 1994 because of financial disagreements and construction delays.