"Know Thy Neighbor" is a short story by Elisabeth R. Lewis. It was first published in the February 1953 issue of Galaxy Science Fiction.
This is the only recorded work from Elisabeth R. Lewis, and it's a real shame. This is one of my favorite works I've read in the two seasons of Vintage Sci-Fi Shorts. If you know anything about Elisabeth R. Lewis' life or career, please send me a note on Twitter at @SciFiShortsPod.