Can the Supremes haul someone into the Court for contempt? I would really like to see that.
No.
Only people in the court room who are supposed to be there can be held in contempt if they get out of line. In SCOTUS that means just the Lawyers arguing before it or anyone sitting in the court room like reporters, the sketch artist, or a party in the case - but they don't testify, just sit and listen.
And since SCOTUS is an Appellate Court, not a Trial court, no witnesses are involved who would give testimony as that's already been done in a lower court.