It was a cinch to stop him remembering.
3 seconds sound clip from the The Enforcer (1951) movie soundboard.
You can hear this line at 01:14:29.474 in the Blu-ray version of the movie.
Quote context
[...]
- But they saw us! They'll know us! That kid lookin' at us with her big blue eyes. She'll remember.
- They don't know us. We know them. Their names will be in the papers tomorrow morning, not ours.
- He had nerves like iron. He never even lost a night's sleep over that killing.
- He knew by the way that he looked at him that Tony remembered.
- It was a cinch to stop him remembering.
- But that scared the kid, and she ran out of town.
- It took us a little while to find her. She had grown up and changed her name. But we did.
- That's why I'm the only guy alive who can give him to you for murder.
[...]