The Singh Brotherhood, or the Singh Pirates as they are also called, are as sinister as the Eastern Dark, if not more. These pirates who terrorize the Indian ocean and the seas nearby are the very cause of the birth of the Phantom.
A gang of these pirates had attacked the ship of the 1st Phantom's father. The only survivor was the man who took the oath to fight crime all his life and that his sons and their sons would follow him. The Singh Pirates have been the cause of a few Phantom's deaths. This fact alone is sufficient to give one an idea of the prowess that these 'brothers' in crime possess.