Iranian security forces have arrested an Iranian-American businessman who had promoted improved ties between the two countries, adding to signs that hard-liners in Tehran are trying to block foreign investors from entering the Islamic Republic in the wake of the historic nuclear deal. In the past few weeks, Iranian businessmen with links to foreign companies have been detained, interrogated and warned against wading into economic monopolies controlled by the Revolutionary Guard Corps, according to several businessmen interviewed inside and outside of Iran. Siamak Namazi in an undated photo from his Linkedin profile. About two weeks ago, Siamak Namazi, the head of strategic planning at Crescent Petroleum Co., was arrested as he was visiting relatives in Tehran from his home base in Dubai, according to people briefed on the situation. He was arrested, they said, by the Guard’s intelligence arm, which reports to Supreme Leader Ayatollah Ali Khamenei, not the […]