I am of Russian descent and have primarily focused my interest on the Russian Molokans. They settled on Potrero Hill in San Francisco and many are buried at the Russian Sectarian Cemetery in Colma, CA.
There were Russian Molokans who settled in Southern California. They are buried in the Russian Molokan cemeteries in Commerce and Los Angeles. There are more buried in the Los Angeles area, Fresno, Kerman, San Diego and other cemeteries in Colma. There are a group that migrated to Oregon and to Arizona and many buried there.

There is a Russian Molokan message board (Ancestry.com) where I have made posts of news articles, obituaries, historical informatation. Molokane.org is another source of help.