Firebrand

noun

1. An argumentative troublemaker or revolutionary; one who agitates against the current situation.

   "The member of the college's Communist League was a firebrand who would launch a sit-in or protest march at a moment's notice."

2. A torch or other burning stick with a flame at one end.

   "The crowd cheered as a firebrand was tossed onto the huge pile of wood to start the traditional homecoming bonfire."