Here are the rolenames, discriptions, I could find.
Yuen Biao = 'Little monster' Hsia
Lo Koon Ting = 'Mustache' Lei Kung
Hui Ying Hung = sister of Lei Kung
Luk Siu Fan = Rosa
Chun Pui = Mr. Tien
Maria Yuen Chin Wai (????) = Mrs. Tien
Tien Jun = Mr. Wang Ping Tang
Cho Cha Lee = Li Wei Feng, the informer.
Di Wei = one of Wang's men
Chung Faat = one of Wang's men
Tai San = killer in restaurant
Fung Ging Man= Mr. Tai, loanshark
Chan Lung = son of Tai
Huang Ha = Chui Chow Han
Hsu Hsia = Mr. Ho
Chu Tau = Hsiung, Mr. Ho's man
Chan Chuen = 'pickpocket'
Yeung Sai Gwan = thief
Baan Yun Sang = Roger, cop
Tai Bo = Moore, cop
Ka Lee = cop
Yuen Miu = cop
Ching Sau Yat = I think he plays soccer with cops, but your portret shows him as cop/mini-van driver.
Monday: Db okay again!

Pan Yun Cheung = cop
Law Hoi Kai = driver yellow sportscar
Chui Chung Hok = one of Tai's men
Ko Sau Leung = drives through red traffic-light
Lok Ying Kwan = car dealer (no correct english?)
A pity the actors, the editor couldn't identify, don't have a portret in this gallery.