258511
Securities and Exchange Commission Following a period of time in which he practiced non-securities-related law , Swanson worked at the Securities and Exchange Commission ( SEC ) as a lawyer from August 1996 to 2006 , other than a brief period in 1999 when he worked for Knight Securities .
 Securities, Exchange Commission, Swanson, Securities and Exchange Commission, Securities
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Securities, Exchange Commission, Swanson, Securities and Exchange Commission, Securities