Here are some videos of the warning strike of the union "IG Bauen-Agrar-Umwelt". The union asked me to support them with strike songs. It was nearly noon at 07.June 2018 in front of the main gate of "Heidelberg-Zement" in Schelklingen. 90% of the workers were on strike!
Best wishes from me and Annette, she took the videos and the photos.