Germany: Baden-Württemberg: Datenschutz bei Gemeinden (Broschüre)

Data protection in cities
page 32: GDPR Art 9 needs to be considered along with Art 6 (which seems clear to most)

https://www.baden-wuerttemberg.datenschutz.de/wp-content/uploads/2019/11/Brosch%C3%BCre-Gemeinden-November-2019.pdf