Protesters formed 'a human chain' [=they stood next to each other with their arms linked] around the ancient tree to prevent it from being cut down.
In the United States, the President as the commander in chief is at the head of the military 'chain of command'.
I thought he really won the lottery but he was only 'pulling my chain'. [=he was only playing a joke on me]
(..) a furniture store. Which he built into two, then fifteen... then fifty, then a hundred. Until finally he had the largest chain America had ever seen. But no matter where he went... or what he did... he always found a place for every person bound to him by blood. Your families and (..)1974 The Gambler