- Does Brenner know who it is?
- No, nobody except Kruger.

5 seconds sound clip from the Bullets or Ballots (1939) classic radio play.

You can hear this line at 00:26:29 in the radio play.

Quote context

[...]

- Well, that's good enough for the time being.

- We've been doing pretty well on your information, Johnny.

- So I've been reading in the papers.

- Did you find out who bosses Kruger?

- All I know is that there is somebody higher up, and he controls everything.

- Now, if we can nail that bird, the whole works will fold up on the inside.

- Does Brenner know who it is?

- No, nobody except Kruger.

- Do you think you'll ever get it out of him?

- No, not a chance.

- Well, well? How are you working it? We've got to know.

- Now, look... Brenner is Kruger's number one man.

- If anything happens to Kruger, and I'm going to see that it does, Brenner steps up.

[...]