 One of the prime concerns was the "Lochner era" decisions of the US Supreme Court to strike down legislation passed by state governments and the Federal government for social and economic improvement, such as the eight-hour day or the right to join a trade union.After the First World War, the founding document of the International Labour Organization took up the same terminology in its preamble, stating that "peace can be established only if it is based on social justice".From this point, the discussion of social justice entered into mainstream legal and academic discourse.