104835
However , it was Vladimir Lenin , inspired by Marx 's writing on the subject in his Critique of the Gotha Programme , who claimed the principle to be a fundamental element of socialism within Marxist theory .
 Vladimir Lenin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vladimir Lenin