I don't think that in a technical legal sense it matters, ... It's neutral as to Libby because he has been indicted for perjury and for lying, and nothing in his account seems to sanitize those lies if in fact they turn out to be lies.

For private employers, there is normally no special First Amendment right to get out of work to engage in a protest. A company might decide that it's good for morale to accommodate the exercise of freedom of speech on an issue that is very important to people, but that's an employment judgment not law.

The Boston Red Sox are not owned by the city of Boston. No governmental entity is involved. Private businesses, including sports teams, can impose restrictions on freedom of speech and not suffer any legal consequences.