Stetmann's mecha-swarm teased in WoL

pretty much this

also confederates had a way to control zergs via psy-emitters and there was several zerg bodies in jars hinted at unnatural anorganic growth on them, cyber-wetware in one secret mission so the idea controlling zergs is nothing new, hell even the UED at some point was able to pacify the immature overmind during the brood wars