Remember the Chinese hackers who hacked into gmail last year? Turns out they were able to do that because Google created a backdoor access system into Gmail accounts for the US Government.
Security expert Bruce Schneier says it's not just Gmail that's affected:
China's hackers subverted the access system Google put in place to comply with U.S. intercept orders. Why does anyone think criminals won't be able to use the same system to steal bank account and credit card information, use it to launch other attacks or turn it into a massive spam-sending network? Why does anyone think that only authorized law enforcement can mine collected Internet data or eavesdrop on phone and IM conversations? [...]
In Greece, between June 2004 and March 2005, someone wiretapped more than 100 cell phones belonging to members of the Greek government: the prime minister and the ministers of defense, foreign affairs and justice.
Ericsson built this wiretapping capability into Vodafone's products and enabled it only for governments that requested it. Greece wasn't one of those governments, but someone still unknown -- A rival political party? Organized crime? Foreign intelligence? -- figured out how to surreptitiously turn the feature on.