Rav Kook and Zionism

During controversy over the Hetter Mechirah in 1910, Rabbi Yaakov David Wilovsky (the "Ridbaz") of Safed leveled a serious accusation. He accused Rav Kook of abandoning his religious beliefs and becoming a Zionist in his old age. (In fact, from a very early age Rav Kook was imbued with a great love for Eretz Yisrael.)