It's not secret it's explicit. And sure it's not constrained only to foreign policy, but any criticism of Israel in general.
Any powerful nation essentially acts this way, so it's not unique to Israel. It's not about religion, it's about a nation conducting policies and politics in their self-interest, and people that oppose these actions that go against their own political, national or self-interest. Labels thrown around to block criticism of Israel try to obscure this. I get it, you support them. But it is clear there are organizations whose sole purpose is pushing propaganda and interference to suppress this criticism such as the ADL. They have a huge track record of pushing pro-Israel propaganda and attacking those critical of Israel.
>scanning the internet for publications who have taken an anti-israel's-foreign-policy stance
It's not solely the ADL, the Israeli government itself funds these types of efforts.
See here [0],start at 4:15 though entire video is applicable.
"..instruction day for Wikipedia editors. The goal of the day is to teach people how to edit in Wikipedia...as a way of example, if someone searches the gaza flotilla, we want to be there we want to be the guys who influence what is written there and how it's written and that it's balanced and zionist in nature."
- Naftali Bennett
[0] https://youtu.be/4xl30Re1EUI?t=255
I don't see this any different than how the US funds NGO's to promote pro-western political organizations, or Russian has influence ops to support pro-Russian interests in West.
From the ADL's website:
"ADL works to support a secure, Jewish and democratic State of Israel, living in peace and security with its neighbors. We work to educate and engage on the challenges and complexities Israel faces at home and around the globe."
Again, not secret...explicit.