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Whisteblower Edward Snowden had previously leaked documents in 2013 that alleged the NSA had carried surveillance of the Brussels - based Society for Worldwide Interbank Financial Telecommunication ( Swift ) for several years , but did not specify how .
 data breach: had previously leaked
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 data breach: had previously leaked