I accept that some some political views are unacceptable to you. Do you do background checks on people you might work with to see whether they hold such views?

I accept that some some political views are unacceptable to you. Do you do background checks on people you might work with to see whether they hold such views? Or do you just avoid working with people about whom you found out by accident that they hold such views? That is, are you actively making sure that none of the people around you hold the views you find unacceptable, or is it more of a don't ask don't tell kind of policy, where you don't care if people have unacceptable views as long as they don't mention them in your hearing?