An interdisciplinary study discussing the impact of the national crisis in Mandatory Palestine on relations between Jewish and Arab workers and their respective labor movements. Constructing Boundaries examines the competition, interaction, and impact among Jewish and Arab workers in the labor market of Mandatory Palestine. It is both a labor market study, based on the Split Labor Market Theory, and a case study of the labor market of Haifa, the center of economic development in Mandatory Palestine. Bernstein demonstrates the impact of the pervasive national conflict on the relations between the workers of the two nationalities and between their labor movements. She analyzes the attempts of Jewish workers to construct boundaries between themselves and the Arab workers, and also highlights cases of cooperation between Jewish and Arab workers and of joint class struggle.