The assassination attempt on U.S. President Harry S. Truman occurred on November 1, 1950. It was perpetrated by two Puerto Rican pro-independence activists, Oscar Collazo and Griselio Torresola while the President resided at the Blair House (the White House was being renovated.) The attempt resulted in the murder of one White House police officer and the death of one assassin while President Harry S. Truman was not harmed.
In the 1940s, Puerto Rican nationalists were increasingly angered by what they viewed as great injustices towards Puerto Rico, including the Ponce Massacre, the alleged extrajudicial murders of certain nationalists, the jailing of Pedro Albizu Campos for his advocacy of violent resistance, and the impending change of Puerto Rico’s status from a non-autonomous territory to a partially self-governing commonwealth. They viewed Puerto Rico as a colony demanding independence. (continued on link) Truman assassination attempt