A computer analyst for the Immigration and Naturalization Service was convicted yesterday of receiving more than $50,000 in bribes as part of a wide-ranging conspiracy to sell fraudulent "green cards," which allow foreigners to live and work permanently in the United States.

Tyson Jolliffe, 46, of Sterling, Va., was found guilty by a jury in U.S. District Court in Washington on five counts of bribery, conspiracy, and preparing fraudulent immigration forms, which he tracked through the INS bureaucracy on his computer. Jolliffe, who served as a D.C. police officer for eight years during the 1960s, faces a maximum sentence of 45 years in prison and $192,000 in fines.

Earlier, five other persons, including Jolliffe's wife, Carol, pleaded guilty to taking part in the same operation, which prosecutors said sold about 280 "green cards" at prices ranging from $900 to $4,000. Assistant U.S. Attorney Robert R. Chapman estimated that receipts from the sales totaled about $600,000.

Witnesses at the four-day trial said about 175 of the cards were sold in the Washington area, mostly to immigrants from Africa and the Caribbean. Chapman said cards also were sold in New York City, Miami, Atlanta, and Jamaica. He said one "salesman" for the group, Leroy Anderson of Atlanta, was convicted in the conspiracy last month in Fort Lauderdale, Fla.