I think it's inconclusive if Russia and Saudia Arabia are actually working together to drive US shale out of business or whether that's just a convenient side-e

I think it's inconclusive if Russia and Saudia Arabia are actually working together to drive US shale out of business or whether that's just a convenient side-effect of their own dispute. But yes, what you describe is known as dumping and governments have enforced tariffs or quotas to prevent them. I'm not sure if it's ever been done for oil, possibly because in most cases it'd be political suicide in the US to argue for higher gas prices for consumers.