Asbestos

Between 1930 and 1960, manufacturers did all they could to prevent the link between asbestos and respiratory diseases, including cancer, becoming known, so they could avoid prosecution. American workers had in fact sued the Johns Manville company as far back as 1932, but it was not until 1962 that epidemiologists finally established beyond any doubt what company bosses had known for a long time – asbestos causes cancer.