On top of the antics involving Najib, Zahid and any other UMNO members in filling the vacant post of party President now come threats by UMNO to sue former members who have left the party.
Everyone knows that UMNO are not very bright but to think they can sue a former member for leaving is absurd in the extreme. Anyone can join or leave any organisation as they please and when they please. Unless they have entered into a legally enforceable agreement opening them to penalty if they leave nothing of the sort can happen.
There must still be some members of the legal profession left in UMNO. The temporary management of the party should consult them