Bulgaria - 1991 Constitution

Title Article 1
Chapter 1 - Fundamental Principles
Article

1

(3) No part of the people, no political party nor any other organization, state institution or individual shall usurp the expression of the popular sovereignty.

Categories - Activity and behaviour (Democracy)
Source Gisbert H. Flanz ed. 2004. Constitutions of the Countries of the World. Dobbs Ferry, New York: Oceana Publications.