LOS ANGELES, Jan. 30 — Tens of thousands of pieces of mail come into the huge Immigration and Naturalization Service data processing center in Laguna Niguel, Calif., every day, and as at so many government agencies, it tends to pile up. One manager there had a system to get rid of the vexing backlog, federal officials say. This week the manager was charged with illegally shredding as many as 90,000 documents Among the destroyed papers, federal officials charged, were American and foreign passports, applications for asylum, birth certificates and other documents supporting applications for citizenship, visas and work permits. The...