In early March, left-wing activist and Tel Aviv University professor Anat Matar sat down with the manuscript of the recently published Hebrew edition of Dana Mills’ biography “Rosa Luxemburg,” preparing to write its preface. As she read about the revolutionary Polish Jewish Marxist thinker and activist’s life and work, a stream of alarming messages began flashing on her phone from activists and residents from the Jordan Valley village of Ras Ein al-Auja.