The Grand Moot was the legislative body of Vissia Prime. The Grand Moot was led by a moderator.

In 2156, Jonathan Archer and T'Pol appeared before the Grand Moot to request that Vissia enter the Earth-Romulan War. The body denied Archer's request and then passed the Permanent Embargo on Technology Transfers to Immature Civilizations Act to ensure that no technology was given to Earth. (ENT - The Romulan War novel: To Brave the Storm)

Legislatures
Interstellar states	Detapa Council (Cardassian Union) • Economic Congress of Advisors (Ferengi Alliance) • Federation Council • Grand Moot (Vissia Prime) • Klingon High Council • Imperial Senate (Romulan Star Empire) • Organian Council of Elders
Federation members	Parliament Andoria • Chamber of Ministers (Bajor) • Quorum of Bole (Bolarus) • United Earth Parliament • Zamestaad (Mestiko) • Triexian Curia (Triex) • Vulcan Council