I have 2 members in our not for profit organization who have done much to disrupt proceedings for the last 6 months, and in one case, longer. They have spewed vitriolic articles on the internet, on their website, also sending out to the members. Other than a bit of election fraud, the worst thing they have done is send out emails to the members that are full of lies, falsehoods and spin. Our Ethics rules in the by-laws specifically say " shall refuse to knowingly provide or pass on false information." Also " shall conduct themselves with proper decorum" . As I see it, and I have mountains of proof, with emails and articles etc, they have broken both rules. We, the board, want to revoke their memberships. Are there any particular guidelines we should take in order to do this?