246579
The 1972 Keith decision by the U.S. Supreme Court became a controversial issue mainly because , even though the court had confirmed that the government had the authority to protect the nation from subversive activity and anarchy , it did not outlaw the government 's ability to use electronic surveillance for domestic espionage purposes .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None