Federal prosecutors charged four men of conspiring to export technical equipment to Iran in violation of U.S. sanctions.  One defendant, Shahin Tabatabaei, of Vancouver, Canada, was arrested at the U.S.-Canada border on February 19.  Between 2007 and 2011, Tabatabaei allegedly ran companies in Mexico and Canada that shipped U.S.-origin goods to Iran, via transshipment through Turkey or the United Arab Emirates.  These goods, which have applications in the oil and gas industry, included pressure transducers, thermal imagers, solenoid valves, battery chargers, and gear-motors.  Three other defendants were indicted in the case: Seyed Mohammad Akhavan of Canada; Abbas Moradi of Iran; and Amirreza Sahebjamei of Iran.