The Collaborative International Dictionary of English v.0.48:

Blacklist \Black"list`\, v. t.
   To put in a black list as deserving of suspicion, censure, or
   punishment; esp. to put in a list of persons stigmatized as
   insolvent or untrustworthy, -- as tradesmen and employers do
   for mutual protection; as, to blacklist a workman who has
   been discharged. See Black list, under Black, a.
   [1913 Webster]

         If you blacklist us, we will boycott you. --John
                                                  Swinton.
   [1913 Webster] black lung

WordNet (r) 3.0 (2006):

blacklist
    n 1: a list of people who are out of favor [syn: blacklist,
         black book, shitlist]
    v 1: put on a blacklist so as to banish or cause to be
         boycotted; "many books were blacklisted by the Nazis"