Long before signing the joint pledge with Canada, Israel passed a law making it an offense to participate in or encourage BDS.
And the Israeli high court recently upheld most of it, with one of the justices writing that boycotts can be considered "political terror."
At the B.C. Civil Liberties Association, Vonn says she is certain a prosecution of boycott advocates for hate speech would not survive a charter challenge.
But, she says, the government is certainly sowing "dread and chill," and that that appears to be its main intention in pronouncing zero tolerance.
"We've asked our lawyers. What does that mean?" says CUPE president Paul Moist. "Is it now a criminal offence to walk around with a sign saying close all the settlements, Israel out of occupied territories?"
According to the Israeli newspaper Ha'aretz, pro-Israel activists in Belgium are pushing for a similar law there.
The Obama administration officially opposes boycotts of Israel, and a measure now before Congress would direct American trade negotiators to discourage boycotts of Israeli goods.
But America has no hate speech laws. The U.S. constitution guarantees free speech. So a zero tolerance policy, or the type of prosecutions Canada is considering, would be impossible.