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SFMTA ( The San Francisco Municipal Transportation Authority ) refused to pay the ransom and shut down the fair system .
 ( ransom: refused to pay,  SFMTA ( The San Francisco Municipal Transportation Authority ): victim, the fair system: victim) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( ransom: refused to pay,  SFMTA ( The San Francisco Municipal Transportation Authority ): victim, the fair system: victim) 