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Federal Reserve Chairman Alan Greenspan was on the telephones , making it clear to officials in the U.S. and abroad that the Fed was prepared to inject massive amounts of money into the banking system , as it did in October 1987 , if the action were needed to prevent a financial crisis .
 organization: Federal Reserve; person: Alan Greenspan; geographical social political: U.S.; organization: Fed; date: October 1987
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 organization: Federal Reserve; person: Alan Greenspan; geographical social political: U.S.; organization: Fed; date: October 1987