36919
The Hetch Hetchy dam was finished in 1923 and is still in operation , but the Sierra Club still wants to tear it down .
 Hetch Hetchy, Sierra Club
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hetch Hetchy, Sierra Club