(J) A forcible felony if the offense was related to the activities of an organized gang.
Before July 1, 1994, for the purposes of this paragraph, "organized gang" means an association of 5 or more persons, with an established hierarchy, that encourages members of the association to perpetrate crimes or provides support to the members of the association who do commit crimes.
Beginning July 1, 1994, for the purposes of this paragraph, "organized gang" has the meaning ascribed to it in Section 10 of the Illinois Streetgang Terrorism Omnibus Prevention Act.