The Williams group are also all presidents - three of the USA and one of the Federal Reserve (in the news a lot lately )

When including a red herring group it’s a good idea to make sure it doesn’t work in the group it is meant to distract from ….

@Neil I think it would be incredibly tenuous if there were a group where the link is 'presidents' but three were US Presidents and one was a Federal Reserve President?

To me, Williams was the one that made it obvious that Presidents WASN'T the link.

Since Sauber were once owned by BMW and were known for a while as BMW Sauber there is a case for saying Formula One teams (past and present) would be a correct answer for that group - and the Red Bull/Williams red herrings pointed that way - but this is a good grid.