You can start with anyone that hangs out with AfD, Trump or Steve Bannon.
So which members of the ERG? Farage is not in the ERG, don't think Boris is, and as far as I'm aware Rees Mogg doesn't "hang out" with the AfD. Trump also happens to be the President of the USA, and though he is a nasty bloke, he is nothing compared to the Chinese leader, IRA terrorists etc and he represents 300 million US citizens, and unlike Juncker, Barnier, Tusk etc he was democratically elected.