The Supergang aka Fan wan di(1984) – Siu Jun Wong.

Alan's (Bruce Le) elder brother is killed in his absence, and upon his return, this fleet-fisted fury grimly vows vengeance! Discovering the perpetrators of this fell deed excitingly engenders a violently duplicitous gangland war, and only the deadliest master of martial arts mayhem shall prevail! Furiously fight-packed, and generously goofy, The Supergang is dazzlingly replete with all the head-spinning lunacy one expects from blissfully bonkers Brucesploitation. A must for seasoned Gordon Ho/Joseph Lai addicts, with the burly presence of charismatic Kung Fu killer Bolo making it nigh on essential for all! For me, The Supergang is a genius-level Chop Schlocky spectacular, having a brilliantly bizarre slasher trope digression, an exhilaratingly high quotient of nookie, and so blessed with invigoratingly psychotronic pizazz, I'm massively surprised that AGFA haven't already bagged this warped wonder! On an entirely subjective note, the oft repeated usage of Jay Chattaway's iconic 'Maniac' theme provided an entirely joyous distraction!