Blockade Runners

Blockade runners are a type of vehicle designed to pass through a blockade. Typically, these craft are constructed to be nimble, fast, or to avoid detection by the blockade forces. The people that pilot, crew, or seek passage on such vehicles may also be referred to as blockade runners. These vehicles may have very little armor to increase speed, fast engines, or use some type of camouflage or subterfuge to trick the opposing force. They may be able to go places the blockade cannot reach, such as underwater, through violent storms, into the upper atmosphere, or through portals, teleports, or other dimensions in fictional worlds.
Who pilots the blockade runners of your world and for what purpose?