Abactor

ABACTOR

Noun. Obsolete. Mid-17th to early 19th century.
[Latin, from abact- past participial stem of abigere drive away.]

A person who steals cattle in large numbers

I'm curious what thresholds exist that determine whether you're a lowly cow thief, a grizzled rustler or the Kingpin of the cattle-snaffling world, the lofty abactor.