Riley Riddle because you know you want to

This is probably wrong, but I'm going to take a stab at it:

Explanation:

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.

I know these are kind of a stretch, but it's the first thing I could think of that managed to sort of fit all the lines.

The word is

---

My prefix is humble

My suffix is prime

I know all the secrets of this little town

And if you need me, just look around.

My infix assisted a Russian in crime

---

Hint 1:

✓

Hint 3:

✓

I'm pretty sure that this is not the answer, but for fun's sake:

My prefix is humble

my suffix is prime

And if you need me, just look around

Note to readers: This is NOT my typical Friday night, but I'm sure it is for some people :-)

I guess:

Prefix:

Infix:

Suffix:

Other clues:

And if you need me, just look around.

The Super Final Very Last Hint