Movers and shakers
Definition 1 of 1
Pro Tip 1/3Power Implication
This phrase implies these people can initiate major change or have significant influence. 
She was known as a mover and shaker, influencing new trends in technology.
Pro Tip 2/3Not Literal
The phrase is metaphorical, not about people physically moving or shaking things. 
As a mover and shaker in politics, he challenges the status quo.
Pro Tip 3/3Positive Connotation
It usually has a positive connotation, praising someone's achievements or capabilities. 
Mia became a mover and shaker in the art world with her innovative gallery.