GlobalSecurity.org provides us with a simple narration of the history of Hamas showing that it was an offshot of the Muslim Brotherhood.
"HAMAS, which includes military and political wings, was formed by the late Sheik Ahmad Yasinat at the onset of the first Palestinian uprising or Intifadah in late 1987, as an outgrowth of the Palestinian branch of the Muslim Brotherhood. The armed element, called the Izz al-Din al-Qassam Brigades, conducts anti-Israeli attacks, including suicide bombings against civilian targets inside Israel. Social-political elements engage in "Dawa" or ministry activities, which include running charities and schools, fund-raising and political activities. A Shura council based in Damascus, Syria, sets overall policy. Since winning Palestinian Authority (PA) elections in 2006, HAMAS has taken control of significant PA ministries, including the Ministry of Interior. HAMAS formed an expanded, overt militia called the Executive Force, subordinate to the Ministry."
We don't have to go far however in the details of the history of Hamas since from their own words and embedded in their own charter is the true nature of the group that they are the Muslim Brotherhood's arm in Palestine.
The Islamic Resistance Movement's Relation With the Muslim Brotherhood Group:
The Islamic Resistance Movement is one of the wings of Muslim Brotherhood in Palestine. Muslim Brotherhood Movement is a universal organization which constitutes the largest Islamic movement in modern times. It is characterised by its deep understanding, accurate comprehension and its complete embrace of all Islamic concepts of all aspects of life, culture, creed, politics, economics, education, society, justice and judgement, the spreading of Islam, education, art, information, science of the occult and conversion to Islam.
Now one of the first troubling act and as a could be a sign of things to come happened during the protests in Egypt to oust President Mubarak was when Hamas prisoners in Egypt escaped and returned to Gaza. This story wasn't covered and the Hamas connection was barely mentioned at all by the mainstream media.