He was the boss of the White Gang within the Saint Rodu police force. His gang members pushed and pulled, thrusting him into the position of captain of the Niangniang Temple precinct's action team.
However, those without resources at the top found it difficult to advance any further.
Gru realized he had reached his limit and, to go further, he chose to take a desperate risk.
In hindsight, the Red Street kidnapping case he planned was somewhat successful, but it also completely exposed his existence to many people.
The White Gang within the police is actually a type of mafia, differentiated as such only to distinguish them from the ordinary mafia.
The history of the White Gang is quite ancient, but it has always lacked organization as officers, after all, are subjected to intense vertical management within the law enforcement system.