Lefty" is a pseudonym of an inventor whose identity is currently unknown. This nickname is borrowed from the classical Leskov work about the talented craftsmen from Tula who could shoe a flea. Lefty supplies criminal gangs with various anomalous devices and substances of- supposedly- his own design and manufacture. It is known that Lefty is aware of the Foundation, although there were no hostile actions directed towards the Foundation on his part. Nevertheless, capturing Lefty is a priority task