Two leaders of a mosque in Albany, New York, have been sentenced to 15 years in prison in a case that raised major questions over the conduct of government officials. The men, Yassin Aref and Mohammed Hossain, were convicted of aiding a government informant in a fictional plot to assassinate a Pakistani diplomat. Defense lawyers say the FBI used entrapment on two men who had no prior criminal history. The case has also drawn scrutiny for coming out of the Bush administration’s warrantless spy program. At his sentencing, Yassin Aref said: “I never had any intention to harm anyone in this country. And I don’t know why I’m guilty.”