In what cases does the control of the Union extend over the states?
The control of the Union extends over the states in certain cases, such as:

1. In case of a Proclamation of Emergency, when Parliament has the power to legislate with respect to any matter in the State List (Article 250).
2. When the President issues an order directing any State to observe any specific instruction regarding safeguarding the financial stability or credit of India (Article 365).