Article 256: Obligation of States and the Union. It states that the executive power of every State shall be so exercised as to ensure compliance with the laws made by Parliament and any existing laws which apply in that State, and the executive power of the Union shall extend to the giving of such directions to a State as may appear to the Government of India to be necessary for that purpose. This is a direct power of the Union to issue directions. Article 257: Control of the Union over States in certain cases. It provides for Union control over states in specific matters like construction and maintenance of means of communication of national or military importance, and protection of railways within the state. This is another power to issue directions. Article 365: Effect of failure to comply with, or to give effect to, directions given by the Union. It states that where any State has failed to comply with, or to give effect to, any directions given in the exercise of the executive power of the Union under any of the provisions of this Constitution, it shall be lawful for the President to hold that a situation has arisen in which the government of the State cannot be carried on in accordance with the provisions of this Constitution. This failure can be grounds for imposing President's Rule under Article 356. This article gives teeth to the Union's power to issue directions. Article 356: Provisions in case of failure of constitutional machinery in a State (President's Rule). While it grants the ultimate power to take over state administration, Article 365 often provides the grounds related to failure to comply with Union directions. Other options contain articles not primarily related to Union control over state functioning in this manner (e.g., Art 368 - amendment, Art 363 - bar to court interference in specific disputes, Art 313 - provisional provisions for services, Art 349 & 350 - language related provisions).