Who are the Irgon and Haganah, and what was their role in the creation of the state of israel?

Question

Arabs often refer to those two extremist Jewish organizations (Irgon and Haganah) who basically started the Jewish state in 1948. According to Arabs, those two organizations are the ones who started the state of israel by massacring and terrorizing the Palestinians out of their lands and expelling them by the millions in order to repopulate their land with Jews which were brought from all over the world. Why don't we hear about those two organizations anymore, are they extinct?

Answer 1

Irgun was a clandestine militant Zionist group (what nowadays would be commonly known as terrorist group) that operated in the British Mandate of Palestine from 1931 to 1948...Irgun launched a series of attacks which lasted until the beginning of World War II, in which more than 250 Arabs were killed. These attacks coincided roughly with Irgun's campaign to facilitate the immigration of European Jews who faced discrimination, murder and pogroms in Europe...
Haganah was a Jewish paramilitary organization in what was then the British Mandate of Palestine from 1920 to 1948. It was the main precursor for Israel's army: the IDF ...
Yes is true that they were the ones who started the state of israel by massacring and terrorizing the Palestinians ...
http://en.wikipedia.org/wiki/List_of_Irgun_attacks_during_the_1930s

Answer 2

Haganah was the IDF before Israel was a state, it was the unofficial jewish army.