Following that whole monkey shooting business a few months ago….
… I was the assistant manager on a Zimbabwean farm (I was born there, innit!)- my opposite number from the neighbouring farm and I would sometimes go up into the rocks and snipe monkeys from miles away with a 303 or a 762.
The excuse was that they used to raid our Maize, so we'd make an imaginary line and snipe them when they crossed. They soon learnt. The labourers liked eating them.
Another method.
Obtain a thin necked Vase; fill with salt.
Tie to tree-trunk within range of monkeys.
Scout monkeys find salt.
Alpha male chases scouts and keeps salt to himself.
Approach Alpha with can of silver paint. (at which point alpha male won't be able to get his hand out of the vase and the others scarper; stupid animals)
Paint Alpha male silver and cut loose.
Alpha male will run toward pack, who will shout that a silver monster is chasing them, which will make him run and so-on.
Effective monkey dispersal techniques.