The monograph Solidarity as a Communion and Brotherhood of Working People, edited by Władysław Zuziak and Amadeusz Pala, is the second volume in the series The Idea of Solidarity Today. The book is the result of an international scientific conference held in November 2021. It presents an interdisciplinary approach, analysing contemporary challenges regarding the solidarity of working people from a philosophical, theological, and socio-economic perspective. The publication addresses, in particular, the problem of the globalisation of the world economy at the expense of workers rights, as well as issues related to crises such as the pandemic. Particular attention was paid to the role of Christianity, which has become the foundation of the Polish experience of solidarity and still has the potential to support the creation of community and bonds of brotherhood among working people.