Psychology and morality of political extremists: evidence from Twitter language analysis of alt-right and AntifaMeysam Alizadeh, Ingmar Weber, Claudio Cioffi-Revilla, Santo Fortunato and Michael MacyEPJ Data Sci., 8 1 (2019) 17DOI: https://doi.org/10.1140/epjds/s13688-019-0193-9