Have a finger in every pie
Definition 1 of 1
Pro Tip 1/3Meddling Nuance
Implies interference in different things, not just involvement. Some may view it negatively. 
He tends to meddle too much; always looking to have a finger in every pie.
Pro Tip 2/3Informal Use
Used in casual or informal situations, might not suit formal writing or speech. 
At family gatherings, Aunt June must have a finger in every pie, organizing everything!
Pro Tip 3/3Power and Control
Often implies a desire for control or influence in various activities or decisions. 
As the CEO, she likes to have a finger in every pie to maintain control over the company's direction.