The San Juan group of the ACU saw its start in 1960, beginning with a few recently-arrived agrupados that met on a regular basis to pray and discuss religious and apostolic matters. A year later, Father Llorente went to Puerto Rico to give the group Spiritual Exercises, providing an impetus for further growth. Over time, the San Juan group has established a strong reputation throughout the island for its annual Spiritual Exercises, which continue to form the base of its apostolic work.