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Who are you loyal to? Your family, partner, employer? Why? Mike Williams talks to people whose loyalty has been challenged – from the wife of an unfaithful husband, to a doctor who blew the whistle on her employers. Are we ultimately only really loyal to ourselves?

A Catholic priest argues that it is better to be committed to values than loyal to superiors. Mike also hears how loyalty can be created to get people to kill – such as in the military.

(Photo: A loyal dog looks up to his master. Credit: Christopher Furlong/Getty Images)