The 3 criminals that kidnapped Frank Sinatra jr. were Barry Keenan Joe Amster and John Irwin. Barry keenan and joe amster were the two people that ran into Frank's changing room tied him up and escorted him out to their getaway car. They held Frank for 2 days demanding $240,000 from the singers father. They kept frank blindfolded the whole two days until John Irwin decided to let him free. On December 11 sometime in the morning Joe amster and Barry Keenan went out to retrieve the money left by the FBI to release him John became scared of the repercussions of this heinous act and let Frank free where he walked a few miles to bel air