Edit: One time, I was at my in-laws' house and there was this bigass fly none of us could swat. Little shit legit dodged a fly swatter. But I spotted a zebra jumping spider hanging out in the window. So I ended up herding annoying!fly into that window, and suddenly BAM. Spider fren got a meal the size of herself, and we had no more annoying fly. Teamwork.
It took me far too many braincells to realize that this headline means "being mean to scabs is effective" and not "being mean to scabs is, itself, doing work."