It was the announcement of Father Gruner's death in a very untimely manner that became the elephant in the room.
And it stunk mightily.
"Marcel Francois Lefebvre ... His father, an official in a textile company, was a
monarchist and a devout Catholic who said daily prayers in Latin. Of his seven brothers and sisters, four others became priests or nuns.He attended a seminary in Rome that was headed by a sympathizer with Action Francaise, a far-right anti-Semitic and anti-democratic movement that was condemned by Pope Pius XI.
He obtained doctorates in theology and philosophy before being ordained in
1929."
f/
here (emph. DZ P) Please feel free to vet the source, I encourage you.