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In the late 1860s , Riley returned to the U.S. , where he became an active socialist and gained experience as a journalist .
 person: Riley
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: Riley 
Answer:
 person: Riley