In recent years, the Shadows seem to have dropped the latter two issues, focusing more on the health of the honor system. The IMPs are a traditional ring society, meaning that their membership is not secret. The IMPs were formed in the early part of the 20th century, reputedly when Pres. Alderman forced the rowdy members of the Hotfeet Society to go underground, thus spawning the group's name. The IMPs don their devil horns and grab their pitchforks to go marching several times a year, and tap new members at those times.
Some IMPs elect to wear the society's ring, a devil's head figure.
While not all of the society's activities are known, they do sponsor scholarships and awards to professors. The Zs join the IMPs and 7s as the only three societies allowed to leave their marks on University buildings. The identity of society members is revealed at Final Exercises, when Zs wear their society rings to graduation. The Zs attempt to maintain secret membership, and sponsor a number of scholarships and fellowships, as well as a first-year recognition dinner. Though they have remained relatively quiet, the 21s have sent letters of both recognition and condemnation to various groups and individuals around Grounds, and recently left 21s on Big White Tent and other locations around Grounds.