That's what the Islamic Courts Union were doing in Somalia after the government collapsed into anarchy, and they were reasonably effective at stamping out lawle

That's what the Islamic Courts Union were doing in Somalia after the government collapsed into anarchy, and they were reasonably effective at stamping out lawlessness, but they were taken down by Ethiopia and the US and the vacuum was replaced by the Shebab, who are far, far worse. https://en.wikipedia.org/wiki/Islamic_Courts_Union https://en.wikipedia.org/wiki/Islamic_Courts_Union