Some trees are covered by Tree Preservation Orders (the name may vary from country to country) It is illegal to fell or prune trees in an area so covered without permission. If the trees are not covered and in and in your neighbours' garden then there is nothing you can do.
Check with your local authority or local council. They may have local laws about this.
It's illegal.
Yes it is illegal because it it vandalism.
Yes
No its completely not
It is TRESPASSING.
Yes it is illegal to raid someones garbage.....
no but is is unormal and gross
Yes Yes
not unless you get caught
It depends on where you are.
Yes, but it is illegal and an invasion of their privacy.
Yes it is so dont do it!