Why is Gitlow considered a substantive due process case even though Gitlow loses? How is Powell a substantive due process case? Does the SCOTUS seem to be pulling back from substantive due process in Nebbia?

Sources :

Gitlow; https://www.oyez.org/cases/1900-1940/268us652

Powell: https://www.oyez.org/cases/1900-1940/287us45

Nebbia: https://www.oyez.org/cases/1900-1940/291us502

try to keep it to a page or 2