> How would the venue actually know that she's unrelated to the dispute? They're not going to have access to the internal management chart of the law firm in order to be able to precisely delineate in every case exactly who gets admitted and who doesn't.

The venue knows not, but that venue is a tiny cog in an empire owned by the parent group.

The parent group compiled the ban list by trawling the large law firms website for images .. and the parent group knows which offices and groups of personnel are involved in a specific case.

With large and potential trans national groups doing this it has a parallel with, for example, one country banning an entire countries citizens from entry or doing business .. on the basis that a small group of citizens took action that was undesired.

Very large companies have very large numbers of employees and many different activities on the go.

Should, for example, several thousand people be banned from watching streaming television because 15 people in the company they are associated with are involved in a class action against a media group?