WASHINGTON — The Justice Department has charged three men in an alleged plot that originated in Iran to kill an Iranian American author and activist who has spoken out against human rights abuses there, officials said Friday. The men, Rafat Amirov, 43, of Iran, Polad Omarov, 38, of the Czech Republic and Slovenia and Khalid Mehdiyev, 24, of Yonkers, New York, were charged with money laundering and murder-for-hire in an indictment unsealed in federal court in New York. Amirov, a leader of the group living in Iran, "was tasked" with targeting her by unnamed people there, the indictment states