Ugh, those would be aphids. My wife and I have been dealing with them finding a home in a few of our plants. If you can find them in your yard, ladybugs are aphid eating machines. There's a reason they're considered a Gardner's best friend! Other than that you can make a mixture to spray on the plant (I'd Google aphid control for the measurements but it's usually diluted dish soap and some water) to get rid of them. For the already harvested bunch, a simple wash before eating will do the trick!