Do you want them there or want them gone? Looks like your feeder's throwing some corn outside the pen. If you can stop that, either by a bigger pen, slowing down the sling speed, or installing a "sling control device" they'll probably move on. Good looking pigs, I personally wouldn't mind them hanging around.
"I have no idea what WW-III will be fought with, but WW-IV will be fought with sticks and stones."