"They" is a short story written by American science fiction author Robert A. Heinlein. It was first published in the April 1941 issue of "Unknown", and can be found in Heinlein's short story collection "The Unpleasant Profession of Jonathan Hoag". It also appears in a number of multi-author anthologies.

Can we draw the following conclusion?
"They" was published in April 1941.
Yes