A supposed act of revenge against Fannie Mae was thwarted when engineers found a covert, destructive script tucked into a routine Unix file, and the suspect — 35-year-old Rajendrasinh Babubha Makwana — was taken into custody. Makwana, an Indian national working for an Omnitech subcontractor as a Unix engineer at Fannie Mae’s Urbana, Maryland site, was dismissed on October 24...