There is a strong tendency, almost a rule, that anarchist groups tend to fall apart once they have more than 20-30 members in any city or 50 to 60 overall. Or at the very least an organisation that once felt like it worked very well becomes one that feels sluggish and starts requiring too much effort to achieve limited results in the longer term. There are exceptions which mean this is not inevitable but why does this happen and more importantly how can we avoid it in our organising?
The cause may be simply a limitation of our brains and in particular the number of complex inter relationships between people we can track. Or, more correctly, a failure to acknowledge that this limit means that informality will fail and formal administration is more and more necessary as group size rises. A lesson that is not just relevent to anarchist but to all attempts at horizontal organisation.
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(If you arrived here from a search for Dunbar’s number
and know little or nothing about anarchist organisation
you might want to read
Are Anarchists in Favour of Organisation).