Hamas has ruled Gaza and the lives of the two million Palestinians who live there since 2006. Hamas Contained, first published in 2018, offers a history of the group, drawing on interviews with organization leaders and their publications. Tareq Baconi maps Hamas's thirty-year transition from fringe military resistance towards governance, culminating in Israeli efforts to contain the movement to the Gaza Strip. Baconi argues that under Israel's approach of managing rather than resolving the conflict, Hamas's demand for Palestinian sovereignty has effectively been marginalized in favor of military action against Hamas, and by implication, all Palestinians in the Gaza Strip. This dynamic—a violent equilibrium between Hamas and Israel and the movement's containment in the Gaza Strip—lasted for sixteen years, until it was decidedly shattered by Hamas's offensive on October 7, 2023. Now with new material that provides an analytical framework and reflection on Hamas's offensive of October 7, 2023, and Israel's ensuing war on Gaza, Hamas Contained is an even more essential guide to understanding Hamas and the brutal violence of Israel's war on Palestinians.