Intra-Union Dispute - Any conflict between and among union members, including grievances arising from any violation of the rights and conditions of membership, violation of or disagreement over any provision of the union’s constitution and bylaws, or disputes arising from chartering or disaffiliation of the union. [Mendoza vs. Officers of Manila Water Employees Union (MWEU) (2016) & [Sec. 1(bb), Bk. V, Rule I, Omnibus Rules, Impl. PD 442]