What Alvarez and scores of residents of her impoverished Havana neighborhood found at their doorstep was a pocket-size reprint of Bush's Jan. 20 inaugural address in which he vowed to free the world of tyranny. The speech and a second pamphlet containing the UN Universal Declaration of Human Rights arrived anonymously in the dead of night and are part of an escalating U.S. government program to spur political change in this one-party state. For decades, the U.S. government's attempt to penetrate Cuba with information has had limited success. Cuban authorities routinely jam Radio and TV Marti, the anti-Castro broadcasts produced...