Aryeh Lova Eliav was an Israeli public figure who dedicated much of his life to immigrant absorption and settlement. He helped bring immigrants to Eretz Yisrael before and after the founding of the State, led the settlement of the Lachish region, and founded and headed the development of the new town of Arad in the Negev. He later served as a Knesset member and as secretary-general of the Labor Party, and was an independent-minded voice in Israeli politics.
Arad and new communities. The Rebbe encouraged Eliav to support religious life in new communities such as Arad, including establishing a synagogue and religious institutions there (IK 8570), and to use every opportunity — even after leaving a position — to promote Torah values in the new communities (IK 8522).
Friendship with Kfar Chabad. The Rebbe thanked him for his friendship toward the residents of Kfar Chabad and encouraged continued good relations (IK 9837), and encouraged him to continue his work helping others and strengthening Jewish values in Israel (IK 9647). In a Pesach letter he wrote of true freedom, personal and communal (IK 9883).
Sources: Wikipedia ("Arie Lova Eliav"); and the Rebbe's letters cited above.