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The ALF continued into the 1990s , causing even more damage , with notable actions such as the jointly claimed ALF and Earth Liberation Front ( ELF ) arson at the US Forest Service Oakridge Ranger Station , which caused $ 5.3 million worth of damage .
 Earth Liberation Front
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Earth Liberation Front