All state power is unified in the legislature in communist states. This is a firm rejection of the separation of powers found in liberal democracies. The constitution is passed by the legislature and can only be amended by the legislature. Judicial review and extra-parliamentary review were denounced by Soviet legal theorists as bourgeoisie institutions. They also perceived it as a limitation of the people's supreme power. The legislature together with its suborgans was responsible for overseeing the constitutional order. Since the legislature is the supreme judge of constitutionality, the legislature's own acts cannot, therefore, be unconstitutional.