This is a stirring social justice hymn written by Michael Mahler when he was still a young man. It sounds like a Marty Haugen song, which isn’t a bad influence to start with. It is in Gather 3rd. edition. The GIA bio mentions his love of musical theatre and that is where his career very successfully went. There are more of his songs to come in this collection before he ventured off into other musical areas.
The sheet music can be purchased at GIA and the text is on page 5 of this bulletin.