It's about nuclear fission - they know about it. They know the danger of it. Long ago they had wars that almost destroyed them. And finally they learned. Now they've outlawed war.
18 seconds sound clip from the Dimension X - The Outer Limit by Graham Doar classic radio play.
You can hear this line at 00:17:02 in the radio play.
Quote context
[...]
- This is where he blacked out. There's no telling how long - minutes or hours.
- Where? How did I get in here? Who are you?
- Intergalactic Patrol? What's that?
- What are they saying, Steve? What are they saying?
- They patrol space. When their detector picks up an atomic explosion, they send a patrol.
- Quiet.
[...]