Looking at a couple of governments that tend towards authoritarian, say Russia and China, some companies have performed okay and some disappear when they fall out of favor.

If elections go the way they might, certain tech and media companies will be out of favor. We've already seen how this might play out. The former president got cross-threaded with Jeff Bezos and almost certainly used his influence (as per credible first person witnesses) to block a cloud computing contract which went to Microsoft instead. Amazon sued and partially won:

npr.org - Pentagon scraps billion contract with microsoft bitterly contested by amazon

Similarly, the former president recently said he wanted a long jail sentence for Mark Zuckerberg as well as military tribunals for his political opponents, who he named.

This is on topic, because the former president has said some uncomplimentary and untrue things about the Chairman. I imagine there is some political risk for BRK if things don't go the right way this fall.