Nihilist
Defined in 2 dictionaries — Black's (1910), Anderson (1889)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A member of a secret association, (especially in Russia,) which is devoted to the destruction of the present political, religious, and social institutions. Webster.
A Dictionary of Law
William C. Anderson · 1889
1. One who denies that anything can be known or shown to exist.* See Nihil; Oath. 2. In Russia, a member of a secret society whose aim is the overthrow of authority as at present constituted, the ulterior view of the more advanced members being the establishment of a socialistic or communistic republic.'' §ee Anaechy; Communism; Government.