Chiefly:<p>- Exporting IEDs that were used against coalition troops in Iraq<p>- Supporting Hamas and Hezbollah<p>Plus all the other items on this wikipedia page: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Iran_and_state-sponsored_terrorism" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Iran_and_state-sponsored_terro...</a>