Civil rights activists became increasingly combative in the 1963 to 1964 period, seeking to defy such events as the thwarting of the Albany campaign, police repression and Ku Klux Klan terrorism in Birmingham, and the assassination of Medgar Evers. The latter's brother Charles Evers, who took over as Mississippi NAACP Field Director, told a public NAACP conference on February 15, 1964, that "non-violence won't work in Mississippi...we made up our minds...that if a white man shoots at a Negro in Mississippi, we will shoot back." The repression of sit-ins in Jacksonville, Florida, provoked a riot in which black youth threw Molotov cocktails at police on March 24, 1964. Malcolm X gave numerous speeches in this period warning that such militant activity would escalate further if African Americans' rights were not fully recognized. In his landmark April 1964 speech "The Ballot or the Bullet", Malcolm presented an ultimatum to white America: "There's new strategy coming in. It'll be Molotov cocktails this month, hand grenades next month, and something else next month. It'll be ballots, or it'll be bullets."