From J-Wiki

The Southern California Nikkei Golf Association (SCNGA) was formed in November 1958 with 14 charter club members. Currently the SCNGA is made up of 13 SCGA affiliate Nikkei Golf Clubs with over 400 members throughout Southern California.

This is included in a collection of wiki entries referenced in the canonical Gen X Nikkei thought-piece 101 Ways to Tell You’re Japanese American by Tony Osumi and Jenni Kuida, published in 1996.