"More than 1,700 environmental activists murdered in the past decade – report"
Killed by hitmen, organised crime groups and their own governments, at least 1,733 land and environmental defenders were murdered between 2012 and 2021, figures from Global Witness show, with Brazil, Colombia, the Philippines, Mexico and Honduras the deadliest countries.
Not exclusively corporate, but also not exclusively states. For the most part I find the distinction between these two (and other) forms of power to be largely a red herring. The real issue is power and its accountability, not the specific form it takes. Though at least in theory, a government can be made to answer to those it governs.
See also private militia and police services, e.g., the frequently-renamed Blackwater / Xe / Academi / Constellis.
<https://en.wikipedia.org/wiki/Blackwater_(company)>
There are of course a vast number of other examples.