Mathematician and Data Scientist, Cathy warns populations against the dangers and impacts of algorithms as tools of social domination, both by public authorities, in the fields of justice, education, access to employment or to the credit, that by the giants of the Net through the collection, the use, even the trade of the personal data. Cathy believes her algorithmic auditing companies like hers are at risk of becoming corrupt. They need to gain more leverage to do things right, with an open methodology.