The Swedish Left Party called upon the Swedish Statistics Office to start collecting data on ethnicity to facilitate the fight against crime. The issue of collecting data on ethnicity and religion has become the focus of attention in Sweden when it was revealed that foreigners are responsible for the majority of certain criminal acts (e.g., rape).
The original report from SVT that the article quotes does not claim that the Left Party wanted to gather data on religion and ethnicity to help fight crime. In fact, the party wanted to collect such data to help counter discrimination and visualise the vulnerability of different groups. https://www.svt.se/nyheter/inrikes/v-kongressen-rostade-for-att-samla-in-statistik-over-etnicitet