What common applications of electronic monitoring or surveillance equipment are there?

Paul Brookes has written:

'Electronic surveillance devices' -- subject(s): Electronic surveillance

The American Civil Liberties Union announced in June 2013 that it was suing the Obama administration over the National Security Agency (NSA) surveillance program. The NSA had been secretly gathering phone records for quite a while (since 2001), ostensibly to monitor terrorists; but the program had little oversight and was never explained to the American people, even though it seemed to be legal under the Patriot Act. The ACLU disagreed, because they felt the program was an invasion of privacy.

As it turns out, the ACLU has a long history of bringing suits against what they consider to be unfair surveillance or too much spying on citizens, even when a president claims he has a good reason for doing so. For example, in 2002-2003, they sued the Bush Administration over the original implementation of the Patriot Act, which (like the NSA spying program) the ACLU felt went much too far in taking away people's privacy.

is when all the persons that are under surveillance know that they are being monitored or recorded...

Robert S Mueller has written:

'Electronic surveillance manual' -- subject(s): Handbooks, manuals, Electronic surveillance, Eavesdropping, Wiretapping