Randall Spilker was a member of the Post-Flares Coalition (PFC). When Katie McVoy introduced the virus she had discovered in containment, VC321xb47 (later known as The Flare) and suggested it as a means of population control to the council, Spilker and Ladena Lichliter tried to convince the other members of the madness of such an act. However Chancellor John Michael approved it and the virus was tested on the population, creating the Cranks.
In The Fever Code, Randall was the one who showed Thomas the consequences of disobeying; exactly what Minho did. He unleashed the Griever to not only test it, but to obtain valuable results.