saw a bumper sticker in hebrew...

and was curious what is was about, there was a prominent USA flag next to it.

Am Yisrael Chai (Hebrew: עַם יִשְׂרָאֵל חַי, pronounced [am jisʁaˈʔel χaj]; lit. 'The People of Israel Live') is a slogan of solidarity among Jews. It is used to express strength and unity, typically in the face of adversity, but also in moments of peace and prosperity. To this end, it has historically featured in Jewish music, literature, art, and politics.

The phrase gained popular use as the solidarity anthem of the United States movement Student Struggle for Soviet Jewry in the 1960s and 1970s. According to The Forward, the slogan ranks second as an "anthem of the Jewish people" behind only Hatikvah, the national anthem of the State of Israel.

https://en.m.wikipedia.org/wiki/Student_Struggle_for_Soviet_Jewry

The Student Struggle for Soviet Jewry, also known by its acronym SSSJ, was founded in 1964 by Jacob Birnbaum to be a spearhead of the U.S. movement for rights of the Jews in the Soviet Union, particularly their right to emigrate to Israel.