sentences:  In the 1950s, the governing Liberal Party was led by President Syngman Rhee.In April 1952, opposition lawmakers and some Liberal Party lawmakers attempted a constitutional amendment but were branded enemies of the state by Syngman Rhee When the assembly voted to have martial law lifted in Busan, Rhee had half of them arrested.After a staged assassination attempt on Rhee, police began to investigate alleged links to the opposition.