Both hearings are part of a larger trend in this year’s Parliament — a turn rightward. Two laws passed this week have been widely condemned by civil liberty groups and advocates on the left. The first is known as “the Nakba bill,” in reference to the Arabic word for “catastrophe” commonly used by Arabs to describe the birth of Israel in 1948. Arabs who are Israeli citizens often commemorate Israeli independence by noting their losses — the destruction of hundreds of villages and the exile of hundreds of thousands of Palestinians.

The new law allows the Finance Ministry to remove funds from municipalities or groups if they commemorate Independence Day here as a day of mourning or reject Israel as a Jewish and democratic state. The original bill, which produced much alarm and was altered, would have imposed prison sentences.

The second new law that has drawn criticism from the left establishes admissions committees for small communities in the Negev and Galilee, areas with large Arab populations. The new law says that communities with 400 or fewer families may set up committees to screen potential residents for whether they fit in socially. At the last minute, a rider was added barring discrimination based on race, gender or nationality, but critics contend it will still serve to keep Arabs out of Jewish communities.

It is precisely such developments in Israel that J Street leaders say are driving many American Jews, especially younger ones, from devotion to Israel. Therefore, they say, J Street has a vital role in advocating its views here and in bridging the gap between liberal American Jews and an increasingly nationalistic Israeli society.

David Gilo, who is the chairman of J Street, said in the hearing that the contract that had long existed between Israel and Jews abroad — one of unconditional support — was expiring and a new one was being drafted. He argued that the new contract was good not only for those abroad but for Israel as well, since it would bring into the fold those who would otherwise be alienated. “The new contract cannot be based on unilateral dictation of what is right, who is right and who is wrong,” he said. “Only agreement on common values and a genuine attempt to understand where each party comes from can reinstate an Israeli-American Jewish partnership.”

Nachman Shai, a member of Parliament from Kadima, said at the hearing that J Street represented an important part of American Jewry, and that Israel should not turn a blind eye to it.