What is "passionists"

The Passionists ( Latin: Congregatio Passionis Iesu Christi) are a Roman Catholic religious institute founded by Saint Paul of the Cross with a special emphasis on the Passion of Jesus Christ. Professed members use the initials C.P. after their names. A known symbol of the congregation is the labeled emblem of the Sacred Heart of Jesus, surmounted by a cross and is often sewn into the clothing attire of its congregants.