Communist Workers Organisation (in Dutch: Kommunistische Arbeidersorganisatie (marxistisch-leninistisch), abbreviated KAO (ml)) was a communist group in the Netherlands. It was founded in March 1978 through the merger of the League of Dutch Marxist-Leninists (BNML), the Communist Workers Organisation (KAO) and the Communist Circle of Breda (marxist-leninist) (KKB (ml)). All of these had their origins in the pro-Chinese faction of the Communist Party of the Netherlands. The main organ of KAO (ml) was Rode Vlag (Red Flag). KAO (ml) was active during the Rotterdam port strike of 1979.