Two men made trouble—and stirred up a social-media frenzy—on the third day of the Conservative Political Action Conference by conducting a literal false-flag operation. The flags were subsequently confiscated by CPAC staff, but not before pictures of audience members waving Russian flags went prank went viral on social media. ason Charter, 22, and Ryan Clayton, 36, passed out roughly 1,000 red, white, and blue flags, each bearing a gold-emblazoned “TRUMP” in the center, to an auditorium full of attendees waiting for President Trump to address the conference. Audience members waved the pennants—and took pictures with them—until CPAC staffers realized the...