It was the invisible walls that penned him in the Negro ghettos around Rampart Street...
7 seconds sound clip from the Destination Freedom - The Trumpet Talks (The early life of Louis Armstrong) classic radio play.
You can hear this line at 00:07:26 in the radio play.
Quote context
[...]
- I don't know what's wrong with me. I'm sorry I take it out on the boy.
- His father didn't know... but the 'kid' knew.
- It was the twelve-hour day the old man put in at the turpentine fields.
- It was the invisible walls that penned him in the Negro ghettos around Rampart Street...
- It was the endless search for a way out of the blind alleys he'd walked for forty years.
- And he hadn't been stirred by the sound of a brass trumpet, like me, as the kid was.
- Louis... you going out again tonight?
- Yes, ma.
[...]