A brain teaser, Fill in the missing words to make a phrase with both the left and right hand sides. For instance, if you were given GRAPE __________ FLY, the missing word could be FRUIT, making GRAPEFRUIT and FRUIT FLY. See comments for full teaser?

Full brain teaser.

Fill in the missing words to make a phrase with both the left and right hand sides. For instance, if you were given GRAPE ______ FLY, the missing word could be FRUIT, making GRAPEFRUIT and FRUIT FLY.

1. TOP ______ AGENT
2. PROXY ______ OF NO CONFIDENCE
3. SECOND-HAND ______ DETECTOR
4. THE SACK OF ______ APPLE
5. ST. LOUIS ______ SIN

Once you have the words, what event does it represent?