The company has relied on government support, but the government is now threatening to 'cut the apron strings'. [=to stop providing support]
He's generous, but there are always 'strings attached'. [=he always expects something in return for what he gives to people]
He really loved her but she was just 'stringing' him 'along'. [=making him think that she loved him so she could use him]
(..) Joey Zasa... You were wrong about him. I trust too much. That's always been my fault. Michael... treachery is everywhere. You still have your fingers on the strings, even now. Let's see more of each other. - Michael, in Sicily? - In Sicily. In Sicilia. In Sicilia. (..)1990 The Godfather Part III
(..) Please join me in welcoming Mr. Michael Corleone. Dad? Tony says that I'm a front for the foundation. That you're using me to pull the strings. - To get the money where you want it. - Please! - To shine up your public image. - Mary! Mary, this is real. This foundation is real. (..)1990 The Godfather Part III