Fun fact! Where a compound term is formed by joining two nouns of equal importance — such as Sarbanes–Oxley or attorney–client privilege — an en-dash, not a hyphen, should be used.

Apparently the first use of the hyphen disagrees:

> The first known documentation of the hyphen is in the grammatical works of Dionysius Thrax. At the time, hyphenation was joining two pieces of text that might otherwise be read as two separate words by a low tie mark. This was necessary due to the ambiguity inherent in the lack of word spacing. In Greek these marks were known as enotikon, officially romanized as a hyphen.

https://en.wikipedia.org/wiki/Hyphen