What is the name of the secret society at Yale that Logan Huntzberger belongs to?

The secret society at Yale that Logan Huntzberger belongs to is the Life and Death Brigade.

Logan introduces Rory Gilmore to the group after they meet at Yale. The organization is an invitation-only society made up of wealthy and adventurous students who embrace elaborate pranks, theatrical rituals, and dangerous stunts. Its members dress formally for some events, but the group’s real identity is built around rejecting conventional Ivy League seriousness in favor of spectacle and risk.

The Life and Death Brigade becomes especially important in Rory and Logan’s relationship. Rory initially views Logan as reckless and privileged, but participating in the society’s events—including a dramatic nighttime jump and a formal gathering—helps her understand his social world and willingness to challenge boundaries.

The name is sometimes confused with real Yale organizations such as Skull and Bones, but the Life and Death Brigade is a fictional society created for Gilmore Girls. Logan’s friends Colin and Finn are also closely associated with it, and the group later reappears in the revival A Year in the Life.