According to Robert Dreyfuss, author of the enlightening and exhaustive book Devil’s Game : How the United States Helped Unleash Fundamentalist Islam, political Islamism grew exponentially as Israel took control of the Palestinian territories :

Starting in 1967, the Israelis began to encourage or allow the Islamists in the Gaza and West Bank areas, among the Palestinian exiled population, to flourish. The statistics are really quite staggering. In Gaza, for instance, between 1967 and 1987, when Hamas was founded, the number of mosques tripled from 200 to 600. And a lot of that come with money flowing from outside Gaza, from wealthy conservative Islamists in Saudi Arabia and elsewhere. But, of course, none of this could have happened without the Israelis casting an approving eye upon it.

It is from these Islamist roots that Hamas emerged in 1987. Dreyfuss continues

There’s plenty of evidence that the Israeli intelligence services, especially Shin Bet and the military occupation authorities, encouraged the growth of the Muslim Brotherhood and the founding of Hamas [in Palestinian territories].

Indeed, according to former U.S. Ambassador to Saudi Arabia Charles Freeman, Shin Bet—the Israeli counter-intelligence and internal security service—knowingly created Hamas : “Israel started Hamas. It was a project of Shin Bet, which had a feeling that they could use it to hem in the PLO.”

A former senior CIA official recently told UPI that Israel’s duplicitous support for the Islamist groups that subsequently became Hamas was “a direct attempt to divide and dilute support for a strong, secular PLO by using a competing religious alternative.” Dreyfuss agrees, pointing out how useful it was for Israel that an Islamist movement in the Palestinian territories antagonized, in some cases violently, the mass Fatah outfit :

The Hamas organization was a bitter opponent of Palestinian nationalism and clashed repeatedly with the PLO and with Fatah, of course. And there were armed clashes on university campuses in the 1970s and 1980s, where Hamas would attack the PLO, the PFLP [Popular Front for the Liberation of Palestine], the PDFLP [Democratic Front for the Liberation of Palestine], and other groups, with clubs and chains. This was before guns became prominent in the Occupied Territories.

In allowing the emergence of radical Islamism, Israel was following in the footsteps of successive British and American governments and their policy of “the enemy of my enemy is my friend.” Indeed, the Muslim Brotherhood itself, midwife to Hamas, is a creation of British colonialism. In the 1920s, the British, then the colonial rulers of Egypt, helped set up the Muslim Brotherhood as a means of keeping Egyptian nationalism and anti-colonialism in check. Dreyfuss describes the original Muslim Brotherhood as an “unabashed British intelligence front.” The mosque that served as the first headquarters of the Brotherhood, in Ismailia, Egypt, was built by the (British) Suez Canal Company. In the 1930s and 1950s, with Britain’s knowledge and tacit approval, the Brotherhood both challenged anti-colonial parties within Egypt and spread to other parts of the Near and Middle East, setting up branches in Transjordan, Syria, Lebanon, and Palestine, where under the “approving eye” of Israel from the late 1960s to the 1980s, it eventually mutated into Hamas. Following Gamal Abdel Nasser’s rise to power in 1954, both the British and Americans viewed the Brotherhood as a useful weapon against secular nationalism and communism. In his book Sleeping With the Devil, former CIA officer Robert Baer describes the “dirty little secret” in Washington in the early 1950s, namely that “the White House looked on the Brothers as a silent ally, a secret weapon against—what else ?—communism.”