The climate group that threw soup on a Van Gogh knows they annoy you, but that might be part of why their controversial approach works. Contrary to many of these criticisms, there is also a large body of academic literature arguing that radical activism could be beneficial for the environmental movement as a whole. More recently, several polls and surveys have shown that the use of disruptive radical tactics can increase awareness of key issues and generate support for more moderate groups in the same movement. Other studies show that radical tactics are effective when they are contrasted with a set of moderate demands that the government can easily adopt. This article interviewed 12 members from around the U.K., asking how radical flank effects function when applied outside the ivory tower of academia.