Slate reports that Shia LaBeouf has said he is converting to Catholicism - and that it is in large part because of attraction to the Latin mass.
The article gives a fair summary of the reputation of the Latin mass for attracting Right wing reactionaries:
The traditional Latin Mass is at the center of an ongoing controversy in
the Catholic church: the small, conservative group promoting it claims
it is a beautiful and true expression of the faith, while more
progressive Catholics—and Pope Francis—see it largely as a breeding
ground for reactionary beliefs and conflict in the church. The TLM, as
it’s called by those who celebrate it, refers to the “extraordinary
form” of the Roman rite that makes up the rituals and prayers of the
Mass and which was in use until the 1960s, at which point the Second
Vatican Council took place and ushered in the “ordinary form” (Novus
Ordo, or NO).
The overwhelming majority of Catholics attend Novus Ordo Masses; indeed,
the overwhelming majority of Catholics today have likely never seen
anything else. But traditional Latin Masses have a small but highly
enthusiastic faction in the church. The main difference between the two
rites is in style and not substance: In the extraordinary form, priests
recite prayers in Latin instead of the vernacular; they celebrate the
Mass facing the altar, with their backs to the congregants; there are no
female altar servers. Proponents of the TLM describe it as solemn,
beautiful, ancient, mysterious, sacred. Traditionalists believe that the
Latin Mass is key to reviving the faith among young Catholics....
There’s
certainly nothing wrong with enjoying the Latin Mass. (With the caveat
that some traditionalist groups, such as the semi-legitimate Society of
Saint Pius X, incorporate fully outdated parts of the pre-Vatican II
liturgy into their worship, which can include explicitly anti-Semitic elements.)
In the interview, LaBeouf explained that he was drawn to the Latin Mass
because it was “immersive” and felt “almost like I’m being let in on
something very special.” Fair enough!
But the traditionalists who love the TLM can be deeply toxic.
“Trads” embrace traditionalism that goes beyond the language spoken in
services. Many of them reject the reforms of Vatican II altogether, and
stick to uncompromising positions on gay marriage, divorce, and the dress of
women and their role in society. Their extreme counterparts, the
radical traditionalists, or “Rad Trads,” often go further, idolizing the
crusades, making vile comments about Jews and Muslims, and spreading
conspiracy theories that decry the infiltration of the church by evil
forces and accuse Pope Francis of being an antipope or even antichrist.
The Rad Trad community flourishes on Twitter and Reddit and Discord,
trafficking in memes about the saints and feminists and monarchism.
These highly engaged traditionalists may be small in number (most Catholics are blissfully unaware
of the “liturgy wars,” as this debate is called). But they are well
represented among clergy, including bishops and cardinals. And over the
course of Francis’ papacy, their dissent has grown increasingly loud, to
the point that many liberal Catholics began to worry that the culture
wars in the church would lead to schism. The controversy came to a
climax last summer when, in an effort to crack down on the “division”
sown by the traditionalists, Pope Francis laid down strict rules for
when and where the traditional Latin Mass can be conducted. The outcry
that followed was intense.
Pope Francis has not backed down from his position; In June, he said
that those who “call themselves guardians of traditions, but of dead
traditions” were “dangerous” to the church. Traditionalist Catholics
have continued to claim to be martyrs.
And here's the biggest danger sign that LaBeouf is going "Rad Trad":
There’s another reason it seems LaBeouf knows exactly what side he’s
taking: he told the interviewer that he had sought guidance from Mel
Gibson in his conversion process. Gibson is not just an unabashed anti-Semite; he is also someone who speaks at traditionalist Catholic events, builds churches for disaffected orthodox Catholics, and makes friends with radical right-wing priests. (His father, Hutton Gibson, was a leading proponent of the idea that all popes since Vatican II have been antipopes.) In fact, in the interview, LaBeouf said that Gibson was the one who had shown him where to find the illicit Latin Masses.