The Attorney General has direct supervision over the district attorneys of the several counties of the State and may require of them written reports as to the condition of public business entrusted to their charge.
When he deems it advisable or necessary in the public interest, or when directed to do so by the Governor, he shall assist any district attorney in the discharge of his duties, and may, where he deems it necessary, take full charge of any investigation or prosecution of violations of law of which the superior court has jurisdiction. In this respect he has all the powers of a district attorney, including the power to
issue or cause to be issued subpenas or other process.