desertion, abandonment, defection

withdrawing support or help despite allegiance or responsibility; "his abandonment of his wife and children left them penniless"

• abscondment, decampment — the act of running away secretly (as to avoid arrest)
• absence without leave, unauthorized absence — unauthorized military absence
• deviationism — ideological defection from the party line (especially from orthodox communism)

• withdrawal — the act of withdrawing