Read Richard Horowitz’s article at World Policy Institute, What Nisman Said About Iran in full.
It starts with Nismam‘s own words,
“It can be said with certainty that the highest-echelon Iranian government officials were directly responsible for the AMIA attack . . .We will show that said officials made the decision to carry out the attack, defined the manner in which it was to be implemented, and instructed the terrorist organization Hezbollah to carry out the operation in its capacity as a mere instrument, in this case, of the will of the Teheran government . . We will also show that for Iran’s leaders, there was nothing unusual or exceptional about the realization of an attack of this nature. To the contrary: an analysis of the information that has been gathered in this case shows beyond a shadow of a doubt that the realization of acts of terrorism abroad was not the outgrowth of an unusual foreign policy instrument, but was instead based on the principles of the Iranian revolution of February 1979, the ultimate goal of these principles being to propagate Iran’s fundamentalist view of Islam throughout the world.”
The Nisman Report (2006)
And, may I remind you? Iran no longer on Terror Threat List.
An excellent resource on Nisman and his investigation: AlbertoNisman.org