Ann: Chatree Plant 2 Ramp Up and Second Gold Pour, page-51

Algo or high frequency trading (HFT) is legal. Algo/HFT alone, doesn't signify manipulation. That's not to say that some algo/HFT isn't manipulative, but you need to identify more than just an example of an algo's buy or sell order. You need to identify the intent behind the algo's strategy and that's a very difficult thing to prove especially when you are not the exchange or regulator and don't have access to all the information they have.

Notwithstanding, brokers are responsible (see the market integrity rules) for not letting manipulative order flow, through their trading platforms, and into the ASX/CBOE markets. One way brokers comply with the rules, is by having filters in place to prevent manipulative orders from entering the market. So if a broker lets manipulative orders enter the market from one of their algo/HFT clients, then that broker is responsible and is likely to have breached the market integrity rules.

I think your real gripe here is that algo/HFT is unethical because the big boys bully the little guys like us and the exchanges/regulators do nothing about that! I agree with you on this!