Wyrd Sisters Terry Pratchett A Discworld Novel #6 1990
Witches are not by nature gregarious, and they certainly don't have leaders.
Granny Weatherwax was the most highly-regarded of the leaders they didn't have. But even she found that meddling in royal politics was a lot more difficult than certain playwrights would have you believe...
Wyrd Sisters is the sixth novel in the Discworld sequence - the funniest fantasy series ever.