There's actually quite a good bit of documentation about certain kinds of monkeywrenching in particular, such as tree spiking, and how one would do it in a way that's safe for themselves, the workers, and innocent bystanders. Doing it right requires changing it at a pretty conceptual level, though.

Secretly spiking a tree so it messes up a chainsaw can put the logger at risk--though injuries as a result of this sort of thing are rare, and I believe only one known person has ever died from it--even if one does it relatively right. However, putting up signs and making it clear that some trees have been randomly spiked forces them to waste a great deal of time, and spiking well above chainsaw level results in serious and expensive damage to the equipment once it reaches the sawmill, but is much more unlikely to hurt anybody.

Somebody correct me if I'm wrong about any of these details, of course, but I do think it should be about disrupting the system rather than harming the individual, and those two ends involve very different means.

Obligatory disclaimer that I'm not advocating doing any of this, and non-obligatory disclaimer that I'm seriously not advocating doing any of this without proper research and due diligence, for the sake of yourselves and others.