An attempt was made to indiscriminately kill in order to effect social/political change the other day. [CNN] The Mayor of New York City got a letter laced with the deadly poison ricin. Another was sent to Mayors Against Guns, the anti-gun group he founded. The enclosed letter referred to anti-gun efforts as a reason. No suspects have been identified.
The CNN story didn't mention the T word. Evidently 'terrorism' is being reserved for a particular religious group and doesn't apply to others attempting to alter social/political policies by murder.