The unmasked members of the punk-protest group Pussy Riot are getting a crash-course in American pop culture during their latest U.S. trip.

In recent weeks, Nadezhda Tolokonnikova and Maria Alyokhina, the public faces of the balaclava-clad political activist posse, have posed for photographs at the Vanity Fair/Bloomberg White House Correspondents Dinner afterparty, talked obsessive tweeting with Dick Costolo, Twitter's chief executive, and they said they met with staff from the Netflix political series "House of Cards"...