Lynne F. Stewart, the firebrand lawyer known for defending unsavory criminals, now faces the possibility of living out her life like many of them, in maximum-security lockdown in a federal prison. Today, 20 months after she was convicted on terror charges, Ms. Stewart and two co-defendants who were convicted of conspiring with her will be sentenced in Federal District Court in Manhattan. Prosecutors, arguing that Ms. Stewart repeatedly flouted the law to aid the violent designs of an imprisoned terrorist client, have asked Judge John G. Koeltl to condemn her to 30 years in prison. That would be a life...