Night of Roses and Guns

The Night of Roses and Guns was a conflict between the reigning crime family known as the Caleb Family and Club Primavera over control of District 23's underworld. The conflict arose due to disagreements over how to create a better future for the Japanese people.

Aftermath
Following the disappearance of Caleb Keireiji, Rose Haibara became the new ruler of District 23's underworld. Philip Butler organized a deal with the MacDowell crime family, resulting in complete ownership of the exclusivity rights in District 23.

Trivia

 * The name "Night of Roses and Guns" is a possible reference to the American band Guns N' Roses.