The Portland Cement Company plant at PERUS opened in 1925. Located on the outskirts of São Paulo, Brazil’s most populous city, the plant served as the main source of raw building materials for the city. In 1951, prominent Brazilian businessman, José João Abdalla, took over the plant, making it one of the thirty subsidiaries under his control. J.J. Abdalla showed serious disregard to the needs of the workers, neglecting to provide the proper maintenance and development of facilities, which hugely impacted production and quality and safety of working conditions.