Later: Sorry, did not identify FSSP, here identified as “the Priestly Fraternity of St. Peter, a society of apostolic life which celebrates the Roman rite according to the liturgical books in force in 1962.”
The priestly fraternity was founded in July 1988 by 12 priests of the Society of St. Pius X, and several seminarians. The founders left the SSPX to establish the FSSP after the society’s leader, Archbishop Marcel Lefebvre, consecrated four bishops without the permission of St. John Paul II.
There are currently about 340 priests and 180 seminarians in the FSSP. It has parishes and chapels in 147 dioceses in North America, Europe, Oceania, Nigeria, and Colombia.
More here about them and their history.