Human Rights Watch (HRW) has said Israel operates a "two-tier" judicial system in areas of the occupied Palestinian territories it administers, to an effect which provides preferential services, development, and benefits for Israelis living in settlements in the occupied territories while imposing harsh conditions on Palestinians and other non-Israeli citizens. In some cases Israel has acknowledged differential treatment of Palestinians and Israelis, such as having separate roads for both communities and operating checkpoints for Palestinians, asserting that the measures are necessary to protect Israelis from attacks by Palestinian armed groups. In 2011 the Israeli parliament passed a law criminalizing participation in boycotts of Israeli settlements.