Sentence:  Anna Chapman, whose glamorous appearance won her more publicity in the Western media than all the other <WSD>illegals</WSD> combined, was so successfully deceived by a US sting operation that she handed over her SVR laptop to an FBI agent posing as a Russian. 
Meaning of the word marked with <WSD> tags:  A spy working abroad illegally and undercover, without visible ties to his or her country's authorities.