NEWS
March 14, 1992 | PATRICK J. McDONNELL, TIMES STAFF WRITER
The Ahumada and Lozano families are accustomed to receiving tragic news out of the barrio known as Casa Blanca, a square mile of Southern California cityscape where scores are settled privately and outside authority is often viewed with suspicion. For more than a quarter-century, a blood feud between the rival Casa Blanca clans has left the streets strewn with family victims--at least 11 of them dead, gunned down in ambush attacks on sidewalks, in vehicles and on front porches.