The Collaborative International Dictionary of English v.0.48:

Blackball \Black"ball`\, v. t. [imp. & p. p. Blackballed; p.
   pr. & vb. n. Blackballing.]
   1. To vote against, by putting a black ball into a ballot
      box; to reject or exclude, as by voting against with black
      balls; to ostracize.
      [1913 Webster]

            He was blackballed at two clubs in succession.
                                                  --Thackeray.
      [1913 Webster]

   2. To blacken (leather, shoes, etc.) with blacking.
      [1913 Webster]