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The former CIA contractor who leaked top-secret information about surveillance programs used by American spy agencies has been sacked by the company he worked for.Edward Snowden, 29, exposed the way the US National Security Agency (NSA) gains information from internet companies as well as US telecoms using a secret program called PRISM.Mr Snowden travelled from Hawaii to Hong Kong on May 20 carrying a cache of secrets harvested from his employer's servers.He went into hiding in Hong Kong before leaking the data, and his whereabouts are now unknown.Contracting company Booz Allen Hamilton has sacked the infrastructure analyst from the job he held for about three months.