The editor of the "Hindu Patriot" who strongly supported the Indigo Movement was:

Detailed Solution:

The correct answer is “Harish Chandra Mukherjee”.

Harish Chandra Mukherjee was a prominent figure in the Indian independence movement and the editor of the Hindu Patriot. He played a crucial role in exposing the atrocities committed by indigo planters against Indian peasants.

The newspaper became a powerful platform for voicing the grievances of the indigo cultivators, leading to increased public awareness and support for the movement.