There is still a murder case going on in Reno NV over a shootout in a Casino between the Mongols and the Hell's Angels during Biker Death week. The local leader of the HA around here was given like 20 years in prison for receiving "child porn" because he owned a whorehouse called The Old Bridge and was soliciting for girls. He got like 400,000 applications with video. Got pulled over in Montana and they searched his computer and boom. never got out again. He still owns an apartment complex in Reno with "Hell's Angels" painted in 8 foot tall letters on the side of it.
I would doubt this story more from the Mongol- HA getting along part. That will never happen. For many reasons.