Prosecutors said the suspects had explosives "in circumstances that indicated they were armed with the intent to commit a felony, namely, acts intended to cause grievous harm".

BBC: Two Iranians found guilty of Kenya terror plot

Lee Bailey, found her guilty of armed robbery and the use of a firearm to commit a felony.

ECONOMIST: Patty Hearst

Under the current NICS system, buyers may be denied the purchase of a firearm for reasons such as being indicted or convicted of a felony, admitting to being addicted to a controlled substances, having been dishonorably discharged from the Armed Forces, being subject to a restraining order, as well as other regulations.

CNN: Background checks on gun sales: How do they work?