A bust is like a 3-dimensional statue of someone, made to look just like them. This particular bust is of a man named Edward Snowden.
Edward Snowden is a guy who used to work for the United States government, and he found out that the government was secretly collecting lots and lots of information about people. This made him very upset because it felt like a violation of people's privacy, so he decided to tell the public about it.
Some people think Snowden did the right thing, and some people think he did the wrong thing. But either way, his story is pretty famous and some people wanted to make a bust of him in order to show support for him or to remember what he did.