The Collaborative International Dictionary of English v.0.48:

Land League \Land League\ n.
   In Ireland, a combination of tenant farmers and other,
   organized, with Charles Stewart Parnell as president, in 1879
   with a view to the reduction of farm rents and a
   reconstruction of the land laws. -- Land"*lea`guer, n. --
   Land"*lea`guism, n.

         The Land League, of which Michael Davitt was the
         founder, originated in Mayo in August, and at a Dublin
         in October the organization was extended to all
         Ireland, with Parnell as president.      --Encyc. Brit.
   [Webster 1913 Suppl.]