For the wider Middle East, the Hamas-Hezbollah split is a dangerous microcosm of a growing trend. While Hamas controls the Gaza Strip, Hezbollah operates as a parliamentary party in Lebanon, with its own radio and TV station. Hamas and Hezbollah have had a dramatic break-up after the Syrian conflict erupted in 2011. This is a portrait of the organizations’ roots, histories, ideologies, relationships, tactics, political outlooks, and futures. Hamas has fund-raising networks in the United States and Europe, which supplies about a third of its $30-million annual budget. Hezbollah and Hamas draws from primary interviews and documents coupled with a thorough review of current scholarship. Part of the break-up is due to sectarian differences; another part is due to rival regional alliances. It also gets money from Iran and Saudi-born terrorist Osama Bin Laden.