Large Feral cat frequently disturbs smaller ferals, waht should I do?

There's this large feral that constantly tries to do "that" with these small female ferals that I feed everyday. I do scar him off, but he just comes back and attempts to do so again. The other Gerald don't want to come in the house, so, what should I do?

Are any of the cats spayed or neutered?  Does your county have a free TNR service?  If not, some vets will offer free or low-cost TNR services to people who manage feral cat colonies.