The Library of Congress became involved in secret military intelligence in the 1950s.

Evidence

It has to be said: in the 1950s, the Library of Congress secretly became a military intelligence agency. … Because the library harbored so much secret activity, the administrators who got ahead tended to be Cold War hard-liners with security clearances. — Nicholson Baker, Baseless- My Search for Secrets in the…, 435

Categorization

• corroborated: 3 independent passages support this claim — Nicholson Baker, Baseless- My Search for Secrets in the…, 435