The Bush administration will more aggressively pursue violators of the U.S. trade embargo against Cuba, a U.S. prosecutor said Tuesday, in an effort to accelerate the fall of the communist regime. Alexander Acosta, head of U.S. prosecutors in Florida, pledged more vigorous investigations and more aggressive prosecutions of anyone violating the four-decade-old U.S. embargo. President George W. Bush has sought to increase pressure on Cuba to speed the demise of its communist leaders, Fidel Castro and his brother, interim president Raul Castro. Acosta announced to a Miami news conference the creation of a task force comprised of officials from several U.S. agencies which will strengthen enforcement of sanctions against the Castro regime with the aim of hastening a transition to democracy in Cuba. Acosta vowed to prosecute the import and export of goods to and from Cuba, unapproved visits to the Caribbean island, and transfers of hard currency to and from Cuba.