A complete aside from the usual, but it tickled me to see this from my old Cambridge supervisor Christopher Andrew's history of MI5, The Defence of the Realm:
The Cambridge Five were recruited by Arnold Deutsch, a Czech "illegal" working for Moscow Centre. Deutsch was able to enter the UK thanks to his cousin, Oscar Deutsch, vouching for his good character. Oscar was the millionaire owner of the Odeon cinema chain. ODEON stands for "Oscar Deutsch Entertains Our Nation."
You never knew that, did you?