Roger Waters is known for his activism for the Palestinian cause and is prominent in a movement calling for an artist boycott against Israel. His comparisons between Israel and Nazi Germany have led to him being accused of being an anti-Semite.
Waters has called the city's decision to cancel him "indefensible" and has taken legal action against the city of Frankfurt. In a social media post, Waters has published a photo of the gravesite of anti-Nazi political activist Sophie Scholl with a caption noting that the deadline for the city council to respond to his subpoena has passed.