Palantir is pretty core to the Surveillance Society in several supposedly Democratic countries. More in general just about all companies in that space such as the NSO Group makers of the Pegasus software for remote hacking of smartphones are invariably unethical

Similarly the whole business of Investment Banking is pretty unethical, and that definitely includes most Hedge Funds, the latter never being household names.

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Sinclair group in the US, bought up basically every local news station and began inserting propaganda into scripts as stories. Highly insidious because the older population generally trusted their local news anchors more than the national outlets.

GEO group, one of the largest private prison corporations that also manages ice detention facilities and many mental institutions, not sure I need to say much more.