 By 1994, between 3,000 and 5,000 members were assassinated in a systematic campaign to wipe-out the party and its members.A Colombian human rights organisation dedicated to the search for justice for the victims of the UP calls the genocide ‘an alarming and representative case of a persecution of an opposition movement’.In August 2011, the Colombian state, recognising its responsibility, apologised for the 1994 assassination of the last UP senator, Manuel Cepeda Vargas.