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During the heated ideological struggles of the 1870s and 1880s , the magazine tried to steer a course between moderate reformism and the kind of revolutionary socialism it consistently opposed ; Leonid-Lyudvig Slonimsky , a frequent contributor on economic and political topics , wrote a regular " Foreign Survey " which he used " to sketch the outlines of an ideal relationship between liberals and socialists in Russia ’s not-too-distant parliamentary future , which involved one group supplementing its program with demands for social reforms and the other abandoning its calls for revolution . "
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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