The American Enterprise Institute's Katherine Zimmerman testified before the House Committee on Foreign Affairs Subcommittee on Africa, Global Health, and Human Rights on the challenges facing humanitarian organizations in al-Shabaab held territory in Somalia.
The analysis, published on 8 September 2011 by the American Enterprise Institute for Public Policy Research, offers a sound analysis of the problem. The author makes the argument that successful humanitarian intervention in al-Shabaab controlled territory would require the introduction of accompanying military force. While she does not recommend such an intervention, she emphasized that any such undertaking must bear this risk in mind.
You can read her testimony here (pdf).