Opus Dei is one of the entries in 5 Most Notorious Secret Societies.
Opus Dei is a Roman Catholic institution founded in Spain in 1928 by Catholic priest St. Josemaria Escriva.
The group, which was officially approved by the Vatican in 1950, promotes a return to conservative Catholic values and personal sacrifice to God.
Opus Dei is known for its secretive nature, with members using secret greetings and being barred from revealing their membership.
Members are expected to wear a cilice, a small spiked chain, around the upper thigh for two hours each day, and to flail themselves weekly.
Many believe the group has infiltrated global politics and business, with Supreme Court Justice Antonin Scalia and former FBI head Louis Free thought to be members.
But are they just conservative Catholics on a mission from God or part of a greater worldwide conspiracy...?
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