TAIPEI (Taiwan News) – Prosecutors are launching a probe into media allegations that former organized crime leader Chang An-le (張安樂), also known as the “White Wolf,” was supplying Mexico’s Sonora Cartel with fentanyl, reports said Wednesday.

Apart from being a leader of Taiwan’s Bamboo Union crime group, Chang also founded the small pro-Chinese political party, the China Unification Promotion Party. It never won any seats in elections but was threatened with a ban for consistent propagandizing on behalf of China and for involvement in crimes.   

The latest allegations against Chang originated with US conservative author Peter Schweizer. During a promotional interview for a book last year he accused Chang of helping out Mexico’s organized crime group, per CNA.

The Supreme Prosecutors Office said Wednesday it had called on the Taiwan High Prosecutors Office to investigate the allegations.  

Fentanyl is a synthetic opioid drug stronger than morphine. Because of its low cost, drug dealers have mixed fentanyl with other illicit drugs, causing numerous overdose deaths, the US Drug Enforcement Administration said.