It looks as if I have really lost track of off-the-mainstream Catholicism. I have never heard of this line, Duarte-Costa. Is it Portuguese?
I tend to fault seminaries for letting these guys in. Yet if they are psychopaths nobody in charge would have known, and anyone who cottoned on would have been run off.
Archbishop Duarte-Costa was a bishop who gave Pius XI and Pius XII a lot of trouble in 1930's and 40's. He was sympathetic to the USSR and was eventually excommunicated by Pius XII. From there he started the Brazilian Catholic Apostolic Church. Some "Traditional" clergy and bishops derive their Apostolic succession from him. Interestingly, here are some of the ideas Duarte-Costa advocated in 1936:
Celebration of the Mass and administration of the sacraments in the vernacular language;
Permission for clergy to marry;
The abolition of auricular confession, replacing it with general or communal confession and absolution;
Distribution of Holy Communion to the laity under both kinds (i.e., bread and wine);
Institution of the permanent diaconate for married persons;
Celebration of the Mass "versus populi" (facing the people) with the priest behind the altar;
Creation of a Council of Advice, composed of bishops who would govern the Church together with the Pope;
Participation of laypersons in the administration of the Word, of the Eucharist, and in evangelization.
The bishop who was arrested(McCormack) was ordained as a priest under the Duarte-Costa line, but was later ordained a bishop by a Thuc line bishop.