They're going to move him under guard to a private sanitarium where we can question him without any danger of the story leaking out and throwing the whole country into a panic.
7 seconds sound clip from Radar Men from the Moon - Murder Car (S1E5).
You can hear this line at 00:09:18.301 in the Blu-ray version of the movie.
Quote context
[...]
- Well, how did they catch him?
- What did you find out about him?
- His name's Graber, he's an ex-convict out on parole from a bank robbery sentence.
- Well, what about his connection with the invaders from the moon?
- I haven't had a chance to find out yet.
- But aren't they going to try to find out something?
- Yes.
- Henderson is going to let me know as soon as they make arrangements for having him transferred.
- I'd like you to go with me, Ted.
- Sure.
- Is there anything we can do about it?
- Yeah, I got it all figured out.
[...]