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The Brady bill , calling for a waiting period before someone could buy a gun so a background check could be made , was first introduced in Congress in 1987 but it took seven years to pass because of opposition from the National Rifle Association gun lobby .
 Congress, Brady, National Rifle Association
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Congress, Brady, National Rifle Association