The Red Scare: Were Sacco and Vanzetti innocent or guilty?
First, read A. Mitchell Palmer's essay at http://chnm.gmu.edu/courses/hist409/palmer.html
Then read the Maps and The Red Scare sections, and particularly focus on the Summary of Evidence section at http://www.law.umkc.edu/faculty/projects/ftrials/saccov/saccov.htm
Harlem Renaissance
First, read this overview from Poets.org
Next, read the following poems:
Additional poems (including Bontemps, Cullen, Johnson) are available at The Poetry Foundation
http://www.zoranealehurston.com/
Prohibition
PBS Ken Burns Documentary page
Calculating Historic Prices: See links below