(uncountable, dated, derogatory, offensive, ethnic slur) Political support for black people.
1976, William Fletcher Thompson, The History of WisconsinTheir black support confirmed the charge of "niggerism" and helped the Democrats turn the widespread Negrophobia to their account.
1988, Philip M Seib, Who's in Charge?The spot quoted a Klan official saying, "In Alabama, we hate niggerism, Catholicism, and Judaism."
(countable, dated, derogatory, offensive, ethnic slur) Something characteristic of niggers.
1970, Claude McKay, BanjoHe loved their tricks of language, loved to pick up and feel and taste new words from their rich reservoir of niggerisms.
1975, Daniel J Leab, From Sambo to Superspade: the Black experience in motion picturesBut as it was, not until the 1940s did the industry begin to depart significantly from the stereotypes with their "insulting niggerisms"...