During the Fascist regime, Altrei from 1926 was part of the larger Capriana municipality within the Trentino province; it was again affiliated with South Tyrol according to the First Autonomy Statute of 1948.
Fašistliku režiimi ajal oli Altrei 1926. aastast osa suuremast Capriana vallast Trento provintsis; see liideti taas Lõuna-Tirooliga vastavalt esimesele autonoomiastatuudile aastast 1948.