The 1964 Democratic National Convention was controversial because of the dispute as to which delegates from Mississippi were entitled to be present and to vote. At the national convention, the integrated Mississippi Freedom Democratic Party (MFDP) claimed the seats for delegates for Mississippi, on the grounds that the official Mississippi delegation had been elected in violation of the party's rules, as it excluded blacks from voting. Blacks were still systematically excluded by discriminatory provisions from registering and voting in the primaries, and participating in the precinct and county caucuses and the state convention. Nevertheless, the MFDP delegates had all been elected in strict compliance with party rules.