Officials said Mr. Bloch was subjected to extensive electronic surveillance, including a listening device installed in his car.

The most important decision for companies to make, Mr. Tisi says, is whether extensive surveillance will violate the corporate culture or otherwise be counterproductive.

The burglars do extensive surveillance before striking.

Mr McGahey, a prominent communist and mineworkers' leader, was subjected to extensive surveillance, including the tapping of his home telephone.

After extensive surveillance, the police discovered that three distinct crews were burglarizing the container stations and fencing the merchandise.

They have also performed extensive surveillance on social networks such as Myspace.

The 1954 American authorities then evacuated Rongelap and were returned in 1957 with extensive medical surveillance.

Mr. McDonald said the indictments yesterday involved "extensive electronic surveillance."

A recent study by Professor Susan G. Davis documents extensive surveillance of Botkin over more than a decade.

The militants carried out extensive surveillance both inside and outside the targets using human probes, hand-drawn maps and video surveillance.