Sentence:  Earlier that year Italian Jews had come under serious attack when an <WSD>incendiary</WSD>  publication, "Gli ebrei in Italia" (The Jews in Italy), had flooded the bookshops. The author, Paolo Orano, was a Fascist publicist whose book helped to harden Italian public sensibility against the Jews and pave the way for their eventual persecution. 
Meaning of the word marked with <WSD> tags:  Intentionally stirring up strife, riot, rebellion.