Art experts said on Monday, that there was an astounding haul from Boston's Gardner Museum -- possibly the biggest art theft in US history.
The haul from Boston's Gardner Museum was the biggest art theft in US history. 
( z1 steal :ARG1 ( z2 art ) :ARG2 ( z3 museum :name ( z4 name :op "Gardner" :op "Museum" ) :location ( z5 city :name ( z6 name :op "Boston" ) ) ) :ARG1-of ( z7 haul ) :ARG1-of ( z8 have-degree :ARG2 ( z9 big ) :ARG3 ( z10 most ) :ARG5 ( z11 history :mod ( z12 country :name ( z13 name :op "US" ) ) ) ) )