I hate them. They reproduce like crazy and kill plants fast. I think these are potato aphids. They have pink bodies and are devastating my tomatoes.
First I tried Bayer insecticidal soap. I emptied the entire spray bottle over the first two days, then the bug population quickly doubled, so I called Bayer for a refund and got some Neem oil from Lowe's. It was a good bargain (a $10 bottle of concentrate makes about 20 gallons of spray) and appears to be slowly working. I am spraying like crazy. I figured I would give my best effort at organic pest control.