Revisionist Zionism is a nationalist faction within the Zionist movement. It is the founding ideology of the non-religious right in Israel, and was the chief ideological competitor to the dominant socialist Labor Zionism. Revisionism is the precursor of the Likud Party.
The ideology was developed originally by Ze'ev Jabotinsky who advocated a "revision" of the "practical Zionism" of David Ben-Gurion and Chaim Weizmann, which was focused on independent settlement of Eretz Yisrael. In 1935, after the Zionist Executive rejected his political program and refused to state that "the aim of Zionism was the establishment of a Jewish state," Jabotinsky resigned from the Zionist Organization. He founded the New Zionist Organization (NZO) to conduct independent political activity for free immigration and the establishment of a Jewish State. Revisionist Zionism was instead centered on a vision of "political Zionism", which Jabotinsky regarded as following the legacy of Theodor Herzl, the founder of modern political Zionism.
In its early years, and under Jabotinsky's leadership, Revisionist Zionism was focused on gaining British aid for settlement. Later, Revisionist groups independent of Jabotinsky's leadership conducted campaigns of violence against the British authorities in Palestine to drive them out and establish a Jewish state.
Read more about Revisionist Zionism: Ideology, Jabotinsky and Revisionist Zionism, Irgun: Origin and Activities, Lehi: Origin and Activities, Revisionist Zionism: Ideology