Secret and private security units, known as the Musta'rabim, and called in Hebrew "Mist'arabim", affiliated with the Israeli occupation police. Their members are implanted with features resembling Arab features among the Palestinian protesters and demonstrators.
Among the tasks of theMusta'rabs is to infiltrate in civilian clothes and arrest Palestinian demonstrators. The Musta’rab units began to appear in the 1930s, when their members worked within Zionist gangs such as the Haganah, Etzel, and Lehi.