San Francisco -- An effort by San Francisco to shield eight young Honduran crack dealers from federal immigration officials backfired when the youths escaped from Southern California group homes within days of their arrival, officials said Monday. The walkaways are the latest in a string of embarrassments for city officials who are protecting illegal-immigrant drug dealers from federal authorities and possible deportation because of San Francisco's 1989 declaration that the city is a sanctuary for undocumented immigrants. Until recently, San Francisco flew juvenile illegal immigrants convicted of drug crimes to their home countries rather than cooperate with the federal Immigration...