WASHINGTON -- The practice by some investment bankers of entertaining their government clients came under scrutiny yesterday as the fraud and conspiracy trial of former PaineWebber Inc. Vice President Lance Wilson entered its fifth week before the U.S. District Court here.

Arlin Adams, the independent prosecutor, charged that Wilson provided an illegal gratuity to a government official by paying for an overnight theater trip to New York for Dubois Gilliam, a former Housing and Urban Development Department deputy assistant secretary who is the government's key witness.

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