GAZA CITY — About two dozen international aid agencies that operate in Gaza have suspended travel by their local employees to Israel and the West Bank to protest new exit permit requirements imposed by the Hamas-led government.

Leaders of several nongovernmental organizations said the permit requirements, announced April 4, were an effort by Hamas, the Islamic militant group that controls Gaza, to collect information about their groups through application forms and interviews. Hamas has also sought salary information for the local employees to collect income tax, and it wants to tax vendors providing materials to internationally financed projects in Gaza, which the aid agencies oppose.

A representative of a group of 25 agencies, including some affiliated with the United Nations, said Hamas sent forms “three times bigger” than the previous ones, seeking information “that they have no business to know.” He spoke on the condition of anonymity, saying he did not want to call attention to his agency.

But Tharwat al-Bik, the director of nongovernmental organizations in Hamas’s Ministry of Interior, said the government was “implementing the law, which doesn’t put any public organization above it.” He cited “political motivations” as the reason the agencies refused to cooperate with Hamas, which has ruled Gaza since 2007 but is considered a terrorist group by the United States and Israel.