"The WOrd of the Holy Angels" -- they promote the Litany to the Holy Angels, devotion to one's Guardian Angel, and active co-operation with the work of God's Holy Angels. I hope I have represented them fairly. They are conservative, devout, (face east that is, face the Tabernacle to celebrate Mass), and are some of the holiest priests, nuns and laity I have ever met. The order of priests are the Canons Regular of the Holy Cross out of Coimbra, Portugal.
I should have typed "The Work of the Holy Angels" for Opus Sanctorum Angelorum.
Make yourself familiar with the angels, and behold them frequently in spirit; for without being seen, they are present with you.
With all his power your guardian angel also urges you to choose heaven and in God's name offers you a thousand graces and a thousand helps to assist you to obtain it.
Have a particular love and reverence both for the guardian angel of the diocene where you live and those of the persons with whom you live, and especially for your own guardian angel.
-St. Francis de Sales