As revealed in 2022's – by Steve Orlando, Eleonora Carlini, and Matt Milla – the early Shi'ar empire hated mutants so much, an entire secret society known as the Kin Crimson was formed to help suppress knowledge and influence of mutants within the empire.

Source: https://screenrant.com/professor-x-legacy-mistake-orchis-fall-of-x/

Professional cooks belong to a secret society whose ancient rituals derive from the principles of stoicism in the face of humiliation, injury, fatigue, and the threat of illness.

Source: https://collider.com/anthony-bourdains-parts-unknown-best-food-show/

The Harper's were only partly a secret society, but they still wanted to keep their activities discreet.

Source: https://gamerant.com/dungeons-dragons-honor-among-thieves-harpers-facts-lore-trivia/

They observed that the CCB also covers owning of foreign accounts, secret society membership and conflict of interest of public officials.

Source: https://www.nationalaccordnewspaper.com/tinubu-shettima-public-officials-urged-to-declare-assets/

To understand the differences between the real secret society and the rumored one, we must go back in time.

Source: https://www.buzzfeed.com/entenman/alleged-celebrity-illuminati-members-7587956