152319
The formal call for a conference of revolutionary socialist political parties and radical trade unions espousing revolutionary industrial unionism had been issued on January 24 , 1919 , with the gathering originally slated to commence in Moscow beginning on February 15 .
 Moscow
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Moscow