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Some of the well-known cases he has extensively covered include the so-called Craigslist Killer ' [ 1 ] , New England Patriot Nick Kaczur 's drug use [ 2 ] , abortion clinic killer John Salvi , Clark Rockefeller , the kidnapping and murder of Melissa Gosule and what became the national story of Arrest of Henry Louis Gates .
 Nick Kaczur, John Salvi, Clark Rockefeller
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nick Kaczur, John Salvi, Clark Rockefeller