Plan Classroom involved misleading the USSR about biological weapons.

Evidence

Plan Classroom, kept secret for seventy years, aimed to trick and frighten the Russians into entering into a hazardous, large-scale bioweapons arms race with the United States. — Nicholson Baker, Baseless- My Search for Secrets in the…, 1240

Categorization

• corroborated: 2 independent passages support this claim — Nicholson Baker, Baseless- My Search for Secrets in the…, 1240