www.activistsecurity.org/Infiltrators0.3.pdf

It is never pleasant to think that one of the people you are working with, possibly
very closely, who you go drinking with, who is sleeping with one of your friends,
who seems so full of life and passion is actually trying to undermine everything
you are doing.
Unfortunately, if your group is challenging often very powerful industries or
people with vested interests it is inevitable you will make enemies along the way.
And in a number of cases they will retaliate or seek to counter your campaign,
regardless of how small or large it is. Anyone who has been campaigning for some
time will have those moments when someone or something just does not chime
right, when suspicions are raised that all is not going well. This booklet is a guide
for turning suspicion into certainty.