Who looks after the guards?

The security guard booth at the Islamic Centre of San Diego. A recent high-profile shooting outside a mosque and rising threats to houses of worship have focused attention on security guards. — Ariana Drehsler/The New York Times

ANTONIO Salguero pored over the checklist on his laptop: eight extra security guards, radios for guards and staff, a specific catchphrase for emergency response.

The Jewish High Holy Days are the busiest time of the year for Salguero, who owns a company that handles security for Congregation Beth Israel, the largest synagogue in San Diego.