第一国际是马克思、恩格斯领导的世界上第一个政党性质的国际工人组织。在第一国际的前期、中期和后期,恩格斯分别在思想理论、组织行政和政治宣传三个方面做出了独立的杰出贡献。可以这样说,第一国际的首脑是马克思,副帅是恩格斯。 First International is the first international organization of workers in the world under the leadership of Marx and Engels. In the first, the middle and the later stages of First International, Engels made outstanding and independent contributions to the three aspects of ideological theory, organizational administration and political propaganda respectively. It can be said that the head of the First International is Marx, and the Vice-Chancellor is Engels.