After the Tel Aviv expansion another branch was established in Haifa. Towards the end of 1932 the Haganah branch of Safed also defected and joined the Irgun, as well as many members of the Maccabi sports association. At that time the movement's underground newsletter, "Ha'Metsudah" (the Fortress) also began publication, expressing the active trend of the movement. The Irgun also increased its numbers by expanding draft regiments of Betar – groups of volunteers, committed to two years of security and pioneer activities. These regiments were based in places that from which stemmed new Irgun strongholds in the many places, including the settlements of Yesod HaMa'ala, Mishmar HaYarden, Rosh Pina, Metula and Nahariya in the north; in the center – Hadera, Binyamina, Herzliya, Netanya and Kfar Saba, and south of there – Rishon LeZion, Rehovot and Ness Ziona. Later on regiments were also active in the Old City of Jerusalem ("the Kotel Brigades") among others. Primary training centers were based in Ramat Gan, Qastina (by Kiryat Mal'akhi of today) and other places.