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now , homeland security chief tom ridge described some of those new security measures on top of the ones that are already in place .
 homeland security, homeland security chief, homeland security chief tom ridge
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 homeland security, homeland security chief, homeland security chief tom ridge