John Marshall Harlan II,
Rosado v. Wyman (397 U.S. 397)…
“ Whether or not the view that an insubstantial federal question does not confer jurisdiction-a maxim more ancient than analytically sound-should now be held to mean that a district court should be considered without discretion, as opposed to power, to hear a pendent claim, we think the respondents' analogy fails. ”
