To what is the title of steinbeck's novel possibly a literary allusion

I believe the answer is The title of John Steinbeck’s novel The Grapes of Wrath is an allusion to a phrase in the very open stanza of “The Battle Hymn of the Republic,” which was sung by supporters of the Union during the American Civil War:

rivernaysan = anniversary

for some reason there is another anniversary but, that is correct

- r3ktforgood ☕

the words "slavery," "devils," and "murderer" evoke a sense of disgust.