An archived booklet reveals how communist spooks were instructed to blend in with Finnish locals, with careful advice on the behavior, clothing, and table manners of Finns.
https://www.rferl.org/a/a-guide-for-acting-finnish-for-soviet-spies-of-the-cold-war/30827524.html?fbclid=IwAR0PJRdr4YGHeLQRsTWWdWU3bpJAErbaSePSXDdWEEPOvUzP9GSMQuyq5FA
