In what circumstances does 1367(b) prohibit supplemental jurisdiction?
What rules cover joinder?
Rules 18 (claims)
19 (parties)
20 (claims)
What rules cover intervention?
Rule 24
What is rule 20 used for?
Permissive joinder of parties–parties that may be joined
What is rule 19 used for?
Required parties to be joined–people who are required to be joined.