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Dharam Singh gave up the Gulbarga Lok Sabha seat to accommodate C. M. Stephen , the then Union Home Minister in the Indira Gandhi Cabinet , after he lost the election in Delhi to Atal Bihari Vajpayee .
 Dharam Singh, C. M. Stephen, Indira Gandhi, Atal Bihari Vajpayee
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dharam Singh, C. M. Stephen, Indira Gandhi, Atal Bihari Vajpayee