I know that the goons were supposed to have a pretty sizable agro range on live and by extension, probably a pretty decent assist range too. However, I also have recollections of people being able to farm the cliff golems for spells without being harassed by all sorts of goons that don't even spawn close by.
Exhibit A:
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Exhibit B:
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Agro from this first goon here would then cause even more goons within proximity of that to assist. There were even a couple pulls I was getting the tin NPCs and an ogre SK out assisting the cliff golem. It seems pretty nuts so maybe someone else could weigh in on this.