true or false judicial review is the power of the supreme court to review the actions of the executive and legislative branches and declare them unconstitional
True.
Judicial review is the power of the Supreme Court (and other federal courts) to review acts of the executive and legislative branches, as well as actions taken by state governments and determine their constitutionality. If the court finds that a law or action is unconstitutional, it can declare it null and void. This power was established by the landmark Supreme Court case Marbury v. Madison in 1803.