What was the name for a group of 12 men in old England responsible for each others actions?

Question

I remember learning in school about how men in England were grouped together in a group of 12 or so and were responsible for eachothers actions (breaking law, debt, etc). What was the name of this practice?

Answer 1

Is it possible that you're referring to the Frankpledge?

That wasn't a group of 12 men, but it was a group of men over the age of 12. Their households were collectively responsible for one another's conduct.

For completeness, both @RazieMah & @andy256 point out that the term you're seeking may be tithing, which is a territorial unit (1/10th of a hundred) of people who swear the frankpledge. Credit to them, but I'm updating the answer so that it is a better reference.