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Most of the bump and dump group give the signals on some exchanges via their twitter or telegram channels usually. They cannot hold the dump or pump for more than 1 hour. As I checked one person this is the maximum time they can rule the price.
Do you want to find the bitcoin grow in the market means these group will not be a helpful one as I know.
They can only rule with the cheap tokens and cheap coins only.
This is real. There are so many telegram groups that is intended for a pump and dump act. These groups are mostly composed of at least ten thousand members. They have this schedule on when they will announce what coin to buy and in which exchange. After the announcement, the pump will begin and then the members of this group will start trolling in the chatbox of the exchange, engaging other people to look at the sudden rise of the price. The outsiders will of course take the bait and invest and then after meeting their profit (200% atmost), they will start to exit and dump all of the coins. Thus, the coin loses its actual price, leaving it all dry.