19381
During the 20th century , interest in witchcraft in English-speaking and European countries began to increase , inspired particularly by Margaret Murray 's theory of a pan-European witch-cult originally published in 1921 , since discredited by further careful historical research .
 Margaret Murray
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Margaret Murray