No I didn't.  You didn't do it in the seminar so I thought the junction tables kind of did it for you.

The reason I thought this is because when I went to add ref integrity, there was something already in there that I never put there, and have no idea where it came from.

ie) 3 tables - MSysNavPane
  a-Group Categories
  b-Group
  c-Group to objects

Anyway, apparently I should have added referential integrity.  So would it be:
  OrgT, MemberT, OrgXMemberT

OrgT (left join option 2) to OrgXMemberT - Referential Integrity - Cascade Delete?

AND

MemberT (left join option 2) to OrgXMemberT - Referential Integrity - Cascade Delete?

I wouldn't have to worry about address and contact tables would I?

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Reply from Richard Rost:

You would need referential integrity with cascade deletes set up if you want to delete the junction table record when a member record (or an org record) is deleted.