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In Folsom State Prison. Along with the Crips and the Bloods, 415 KUMI Nation members have recently provided recruitment pools for the Black Guerilla Family (BGF), a gang with similarly large numbers in the Bay area and Northern California. In the Monterey County Jail, brief alliances have been reported among the Bloods, Crips, and KUMI 415 during period leading up to Stanley Tookie Williams' execution.

KUMI 415 have been reported to use prison guards to authorize violence against fellow inmates, such as the case in August 2003 when former correctional officer Leon Holston was charged with aiding and abetting, battery with serious bodily injury, filing a false report by a peace officer and unlawful communication with a prisoner (Associated Press Newswires 9 Sep 2004).

KUMI is the Swahili word for the number 10, and the sum of 415 is 10. 415 also refers to San Francisco's area code.

They have been reported in:

Salinas Valley State Prison Folsom State Prison Monterey County Jail Pleasant Valley State Prison in Coalinga selected areas across East County, California