8417
To this end , in March 2013 , he joined with Senators Jeff Flake , Mark Begich and Mark Pryor in introducing a bill that would close a loophole by flagging individuals who attempt to buy guns who have used an insanity defense , were ruled dangerous by a court or had been committed by a court to mental health treatment .
 person: Jeff Flake; person: Mark Begich; person: Mark Pryor
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Jeff Flake; person: Mark Begich; person: Mark Pryor