A Japanese gang boss and another alleged gangster who had liver transplants at UCLA Medical Center each donated $100,000 to the hospital after their surgeries.
The Los Angeles Times reports the donations came from two of four Japanese gang figures who received new livers at the facility.
In one instance, a plaque on an entryway to a surgery office in the hospital honors a research fund named after the gang boss.
The Times says the gang figures received liver transplants between 2000 and 2004. In each of those years, more than 100 patients died awaiting liver transplants in the greater Los Angeles region.
A UCLA spokeswoman said the university has "no reason to question" the source of the donations. Both sums were used to support research and education for the liver transplant program.
The hospital and the surgeon who performed the transplants said they don't make moral judgments about patients, but treat them according to medical need.