A vocal male-only Christian evangelical organization that holds a lot of rallies. They champion women having roles that are subservient to men, and men being "providers". They are all about anti-lgbt stuff and rather creepy chastity stuff for their daughters. They are strongly aligned with the republican party. Another example of overbearing religious people trying to force their nitwit beliefs on others and effing everything up because of it.

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

I imagine they meant "oath keepers".

But promise keepers is/was an evangelical men's "revival" series that occurred in stadiums across the US.