The Security Party were a political group present in the Vulcan Assembly in the time before the Sundering.

Before Karatek and his comrades became exiles from the Vulcan homeworld, a new political party had formed consisting of the Technology; technocrats who were both ruthless and pragmatic in their approach. Surak estimated that in order to secure their position, they may want to consider an alliance with the Security Party. (TOS - Vulcan's Soul novel: Exodus)

It is unknown whether the party still exists within modern Vulcan society.