The Late Immigrant gangs, such as Bamboo and Sihai, were fostered by the KMT. They were much more centralized and organized.
The local gangs were fractured and regionally focused before the KMT gangs. All they wanted to do was business as usual.
The KMT would use the Late Immigrant gangs as hit man, especially for international jobs to avoid responsibility. Zhang Anle, a founding member of the Bamboo fang, was tasked to murder Jiangnan, who lived in the US and wrote a biography of CJK. The KMT let Zhang and his boss out to dry after the job was done, and feeling betrayed Zhang ratted the KMT out. Since then he has been working for the CCP instead.
To put up a show for the Americans outraged by the killing of Jiangnan on US soils, KMT our up a show of wiping out gangs. They largely left Bamboo gang alone, and went after the local gangs instead.
That’s when some local gang leaders banded together in jail and formed Tiandao league to counter Late Immigrant gangs.
For most of the 90s Tiandao league was quite successful. Recently, as most of the original founders past away, it’s not as unified as it once was.
Yan Chingbiao, the leader of Dajia Zhennan temple is a more local gang leader. His gang pretty much has control of most of central Taiwan.