The Muslim Brotherhood in Egypt is the country’s best organized opposition group.  Its members took part in the protests that swept Hosni Mubarak from power, but they did not dominate them.  Instead, the brotherhood — still banned -  works behind the scenes to win support and pave the way for what its leaders hope is the eventual imposition of Sharia law in the Arab world's most populous nation.  VOA's Luis Ramirez has more from Cairo.