1.   But the covert groupings have had their undercover work rumbled by loyalists.

2.   You have people who do undercover work, I believe, like mingle with students or go to political meetings.

3.   The swoops followed four months of intense undercover work centred on the Scotland Road area.

4.   The unit has pulled together information from undercover work by police forces throughout the country, like here in Manchester.

5.   And detectives from various Valley divisions who lean on the officers from specialized units for undercover work are also disenchanted.

6.   Arizona law-enforcement officials, who use hundreds of snitches, insist that rogues are an exception even in the sleazy world of undercover work.

7.   Because of his undercover work, Michaels requested that his true name and his appearance be concealed before granting a series of interviews that led to this story.

8.   Because of the precautions Evans put in place, black officers can decide themselves if undercover work is too dangerous, Brown said.

9.   A week after the raids, both men agreed to work undercover for the authorities.

10.   But as her undercover work increased, so did the threats against her, she said.