A Riley Riddle:
My prefix is humble, my suffix is prime,
My infix assisted a Russian in crime.
I know all the secrets of this little town,
And if you need me, just look around.
What am I?
Hint 1:
The second line has nothing to do with politics.
Hint 2:
The title of the puzzle is irrelevant to the solution.
Hint 3:
The "prefix" word is mostly used in the UK.
Super Final Very Last Hint:
The word itself is actually very small and simple, mundane even. No higher matters are involved. Think your typical Friday night...
Super Absolutely Very Much Final and Incredibly Last Hint:
The suffIX is Roman.