Thank you Tobi (a.k.a. Bernard Hepton) for this interesting thread.
Even though it is not clear to me how “The Favola di Orfeo” is related to Fascism.
Surely it would be more appropriate to mention “Il Deserto tentato” as an opera paying homage to the regime with its rhetoric of colonialism, yet I don’t think there exists any recording of "Il Deserto"...
It was composed in 1932 on a wordbook by
https://it.wikipedia.org/wiki/Corrado_Pavolini that was a important figure of the fascism and IMHO shows the characteristics of the Italian opera of that period, as a classical / mythological subject use.
On Deserto Tentato
https://www.cambridge.org/core/journals/cambridge-opera-journal/article/abs/alfredo-casella-and-the-rhetoric-of-colonialism/891F1312812A1FA02C50D496F5E446EB