New Delhi, Jan. 6 -- Israel's decision to revoke the licenses of more than three dozen humanitarian organizations this week has aid groups scrambling to grapple with what this means for their operations in Gaza and their ability to help tens of thousands of struggling Palestinians.

The 37 groups represent some of the most prominent of the more than 100 independent nongovernmental organizations working in Gaza, alongside United Nations agencies. Those banned include Doctors Without Borders, the Norwegian Refugee Council, Oxfam and Medical Aid for Palestinians.

The groups do everything from providing tents and water to supporting clinics and medical facilities. The overall impact, however, remains unclear.

The most immediate impact of th...