The Legion of Mary is a worldwide Catholic organization founded in 1921 by Frank Duff in Dublin, Ireland. Its primary aim is to promote spiritual growth and evangelization through active service in the community. Members, known as Legionaries, engage in various activities such as visiting the sick, assisting in parishes, and spreading the teachings of the Church. The organization emphasizes the importance of prayer, particularly the Rosary, and devotion to the Blessed Virgin Mary. Members meet regularly to discuss their activities and deepen their faith, fostering a sense of community and commitment to their mission.