60 Minutes: Sunday April 5, 2015

U.S. Homeland Security Secretary Jeh Johnson talks about the evolving role of his massive security efforts that encompass several governmental agencies; In a rare interview, prominent Irish Republican politician Gerry Adams addresses allegations that he was complicit in the 1972 murder of Jean McConville; Morley Safer meets up with the Wikipedians, the "persnickety," techy types who keep your favorite Internet information website brimming with data. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.