That was my experience 50 years  ago with the body snatchers. Sign up sheets to receive information about future antiwar events went straight to the Vanguard Forum mailing list, and then to the RCMP's, I imagine. 

At the time my questioning the morality of this was met with blank stares by the pod people,  because when you are  the rrreal rrrevolutionaries the end justifies the means, I suppose.