Amen, kick these damn kids out of here
My earliest exposure to Electro was Newcleus, I think they are probably one of the pioneers in what took influence from Funk and early Hip-Hop and added the futurist sci-fi/space aesthetic along with contemporary themes such as video arcade culture, graffiti and urban street culture. Kraftwerk definitely might be considered proto Electro with some of their cuts like Tour De France although probably more Electro Pop than Electro.
Artists like Mantronik, Man Parrish, Cybotron, Bambatta, Ice T, Egyptian Lover etc then later UR and others incorporated elements of Electro into a Techno framework, then lots of artists from Europe continued to develop the style also.
For me Electro has always been a fairly under the radar genre, I love it.