"The Arab League, an umbrella organization comprising 22 Middle Eastern and African countries and entities, has maintained an official boycott of Israeli companies and Israeli-made goods since the founding of Israel in 1948. The boycott is administered by the Damascus-based Central Boycott Office, a specialized bureau of the Arab League. The boycott has three tiers. The primary boycott prohibits citizens of an Arab League member from buying from, selling to, or entering into a business contract with either the Israeli government or an Israeli citizen. The secondary boycott extends the primary boycott to any entity world-wide that does business in Israel. A blacklist of global firms that engage in business with Israel is maintained by the Central Boycott Office, and disseminated to Arab League members. The tertiary boycott prohibits an Arab League member and its nationals from doing business with a company that deals with companies that have been blacklisted by the Arab League."
CRS Report for Congress, RL33961
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html