Message of greetings from the Communist Party of Bohemia & Moravia to the 28th National Convention of the CPUSA.
Message of greetings from the Communist Party of Vietnam to the 28th National Convention of the CPUSA.
Message of greetings from the Socialist Party of Aotearoa to the 28th National Convention of the CPUSA.
Message of greetings from the Workers' Communist Party of Bosnia & Herzegovina to the 28th National Convention of the CPUSA.
Message of greetings from the German Communist Party to the 28th National Convention of the CPUSA.