Resolution resolved: The United States federal government should substantially curtail its domestic surveillance. Violations

Substantial means the main or most important

Cambridge Advanced Learner's Dictionary, 2004 http://dictionary.cambridge.org/define.asp?key=79480&dict=CALD

substantial (GENERAL) [Show phonetics] adjective [before noun] FORMAL relating to the main or most important things being considered: The committee were in substantial agreement (= agreed about most of the things discussed).

"Substantial" means in the main

Words and Phrases 2 (Volume 40A, p. 469)

Ill.App.2 Dist. 1923 “Substantial” means in substance, in the main, essential, including material or essential parts

Ballantine’s Law Dictionary (3rd edition, 1969 , p. 1232)

Substantially . In the main. Essentially.