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-John Walker, a former Navy warrant officer, was arrested...

-John Walker, a former Navy warrant officer, was arrested on espionage charges May 20. Walker's son, Michael, was arrested two days later aboard the USS Nimitz on charges he passed classified information to his father. John and Michael Walker entered a plea bargain; the father pleaded guilty to three counts of espionage and agreed to detail information he passed to the Soviets in return for a lighter sentence for his son, who also pleaded guilty to five counts of espionage. Michael is to receive a 25-year sentence and John is to be sentenced to two life terms to run concurrently.

-Arthur Walker was arrested on espionage charges May 29. He was sentenced on Nov. 12 to three life terms plus 40 years in prison and fined $250,000. Walker, 50, a retired Navy lieutenant commander, admitted providing confidential military documents from defense contractor VSE Corp., where he was employed, to his brother, John Walker.

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-Jerry Whitworth, a retired Navy communications expert, is to stand trial Jan. 13 in San Francisco for his alleged involvement with the Walker spy ring. He is accused of passing communications and Navy code information to John Walker in exchange for $332,000 over 18 years. The data was allegedly given to Soviet agents.

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-Thomas Cavanaugh, an engineer at Northrop Corp.'s facility near Los Angeles, was sentenced to life in prison May 23 for attempting to sell 'Stealth' bomber secrets to the Soviet Union.

-A CIA employee and a Ghanaian citizen were arrested on espionage charges July 11. Officials accused Sharon Scranage, 29, who worked for the CIA, of passing information to her lover, Michael Soussoudis, a Ghanaian intelligence agent. Scranage pleaded guilty Aug. 12 to two counts of disclosing the identities of U.S. intelligence agents and innocent to 16 other counts. Soussoudis pleaded innocent Aug. 12 in federal court in Alexandria, Va.

-Two CIA spies in Ghana -- whose identities Scranage may have revealed to Soussoudis -- were sentenced Nov. 22 in Accra, Ghana. Stephen Balfour Ofosu-Addo, a former chief superintendent of police, was sentenced to life in prison for giving government secrets to the CIA and arranging taps on the telephones of diplomatic missions and high-level government officials. Robert Yaw Appiah, a telephone worker, was sentenced to 22 years for giving a CIA agent copies of keys to manhole covers.

-A Soviet couple pleaded guilty June 26 to espionage charges. The government accused Svetlana Ogorodnikova and her husband, Nikolai, of conspiring to pass secret documents to the Soviet Union. Nikolai, who asked to be sentenced immediately after entering a plea, received an eight-year prison sentence; Svetlana received a 16-year prison sentence July 15.

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-Edward Howard is an alleged Soviet spy who eluded FBI agents in New Mexico in September and is now the object of worldwide search. Federal officials said Howard, 33, was fired by the CIA in June 1983, after 2 years with the agency. He was charged with selling U.S. intelligence secrets to Soviet KGB officials in Austria a year ago.

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