"The investigator flew to Guatemala in April 2002 with a delicate mission: trail a Wal-Mart manager around the country to prove he was sleeping with a lower-level employee, a violation of company policy.

The apparent smoking gun? “Moans and sighs” heard as the investigator, a Wal-Mart employee, pressed his ear against a hotel room door inside a Holiday Inn, according to legal documents. Soon after, the company fired the manager for what it said was improper fraternization with a subordinate".

• Big Brother is Watching You