How do I stop them from putting their trash in my bin?

Hello as the title states, idk 100% who is doing it but I have a good idea who as he always has friends over so I can guess the excess of these multiple small bags of trash are his.

I have to pull my bin in my yard right in the middle otherwise he will toss his trash in AFTER they get empty and he does it within the hour. I'm irritated he just did it sometime today I was ready to just chuck it in the street but I didn't want to get trash everywhere or a innocent neighbor property.

Most of the time we don't have space for our second bag of trash because they do this and it's frustrating that by next week we have a additional bag we are unable to toss if I don't camp my bin b4 they toss more in it, And that's diapers we have in these too so it's awful. (Trash collection won't take anything unless it's in the bin)

Atm I'm waiting for our trash to be collected and probably going to just watch it awhile and hope to catch who bit at that point idk what to do without pissing them off (as much as I want to) or maybe leave a note saying to please stop on my bin or fence.

I'm just scared of the possibility of this guy taking too much offense to it and takes it to another level we don't live in a good neighborhood.