*''Younger'' abstention (ongoing state judicial proceedings)
+
*''Younger'' abstention ("Federal courts may enjoin pending state administrative proceedings that vindicate important state interests only in extraordinary circumstances."<ref>''Allen v. Louisiana State Bd. of Dentistry'', 835 F.2d 100, 103 (5th Cir. 1988)</ref>)
*''Pullman'' abstention (when a constitutional issue might be avoided by allowing state courts to interpret an ambiguous state law)
*''Pullman'' abstention (when a constitutional issue might be avoided by allowing state courts to interpret an ambiguous state law)
*''Colorado River'' abstention doctrine (avoid duplicative proceedings in another state or federal court)
*''Colorado River'' abstention doctrine (avoid duplicative proceedings in another state or federal court)