Well, here's the thing. I've had goldens for 25 years. They were developed to be birdy - they're supposed to be highly interested. How old is your boy? If he's young, then that's pretty typical. If you've not ever done an obedience class with him, I'd try to get in one so that you can learn how to train properly and he can learn manners and to socialize properly.
This is also a management issue. My dogs are never out alone with the chickens and if they're ranging, I keep a constant eye on them. I have 4 dogs right now: 2 goldens and 2 border collies. My 10 year old BC was probably the most fascinated to begin with. The youngest BC is afraid of them. The two 9 year old goldens were rescued fosters who were somewhat interested, that we just took in this year. All four dogs pretty much ignore the birds now, but did have to be introduced on lead at first. Fortunately, an assertive "NO", or Leave it!" were all it took for mine. You need to teach those commands with something far less enticing to begin with and then move up in difficulty.
I can imagine if you have a young male that it won't be that easy, hence, the managment issue. You just simply cannot allow alone time or off leash time with him and the chickens right now.
Not sure about them ganging up on him, but I do know that one of the funniest things I saw when our first crop of chicks were maturing was my youngest BC trotting across the yard looking over her shoulder and then seeing the young rooster following her as they came out from behind a bush. Apparently she got a little too close to the flock for his comfort and he was letting her know.
Beth