Ally doesn't mean you stop your intelligence services against them. It simply means there are things you agree about, currently, and agree to do. Everyone is always jockeying for power. No one stops trying to influence their allies.
Yeah, I'm aware. I didn't say I'm surprised Israel is trying to influence US public opinion, I said I'm surprised how brazen they are being about it. Using your intelligence services behind the scenes is very different to paying to publicly promote tweets from your official national account.