Supposedly Joe peg leg Morgan had ties to some LCN as did a few other Eme members back in the 70s and 80s.
Ultimately I don't think much came of it.
The Eme didn't really reach its full power and reach until about 1993 when they convinced nearly every Southern California Chicano gang to pay taxes to them.
Before that, they were a feared and extremely violent prison gang that ran the inside of a prison. But most of them had no money and some even lived like bums on the outside. Some made money in the 1970s when they let a bunch of them out and they were shaking down small time dope dealers around LA among other things, but still amounted to a gang that just happened to be far more deadly than the average street gang.
After 93 the gang world changed a whole lot in California.

I would not go off of anything seen in the movie American Me. The movie simply has too many inaccuracies. Very, very loosely based on the real story. Made in a time when very little was known about the organization.