Operation Sphinx planned to kill or injure over ten million people.

Evidence

The second-biggest plan—that I can think of right now at least—was Operation Sphinx, a plan to kill or injure more than ten million people by air-dropping a hundred thousand tons of poison gas on Japanese cities. — Nicholson Baker, Baseless- My Search for Secrets in the…, 1074

Categorization

• corroborated: 2 independent passages support this claim — Nicholson Baker, Baseless- My Search for Secrets in the…, 1074