Franz Mehring is a prominent activist of the German and international workers' movement, a leading leftist leader and theorist of the German Social Democratic Party, historian and art critic, and one of the founders of the German Communist Party.

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The harsh facts of class struggle, which broke the illusions of reform of Merlin, the stubborn struggle spirit of the Social Democrats and the achievements made Merlin realize that the proletarian party under the guidance of Marxism had a powerful vitality, and it was invincible. He read Marx's books, such as the French Civil War, while writing a set of articles in France and the Commune, and gradually approached Marxism. He communicated to teach Marx and Engels, and sent their work to them, asking them to criticize. With the help of Marx and Engels, Merlin gradually changed, and in the booklet he wrote, in his Defense, people asked for forgiveness for his once so unwise, that he believed that the authoritarian political system might develop into a just republic.

From 1885 to 1889, Melin served as the editor-in-chief of the Berlin People's Daily, writing in the newspaper accusations against the anti-Socialist Law and the reactionary government of Bismarck, leading to the seizure and search of the newspaper and Melin's residence in March 1883. Melin did not withdraw, and in 1890 in the famous Lindau incident, due to the violent reactionary civilian Paul Lindou's struggle to persecute him--the former lover-actress Chabelsky, Melin wrote "Linda's Wonders" and "Capital and the newspaper. The end of Lindou's Wonders two articles, revealed and criticized Lindau and capitalist society. These events showed that Melin at this time had been transformed from a democrat to a socialist.

In 1891-1882, Marilyn continued to publish The Legend of Leicester in the New Age, analyzing the work of the 18th-century German writer, critic and philosopher Leicester from a historical materialist point of view, and countered the bourgeois scholars' distortions and falsifications of Leicester's creative style. Engels praised the work highly, saying it was "an excellent work", "the best formal siege of the Prussian legend for the first time; Leicester referred to the old Fritz (King Frederick II of Prussia).; and the Prussian legend must be broken, and then Prussia could be merged with Germany." In 1893, Merlin published this booklet in response to the readers' questions, in which he attached the booklet "On Historical Materialism", in which

In 1894 Melin served as editor of the Left-Wing German Social Democratic Journal¡ªThe People¡¯s Journal of Leipzig. The four volumes of the German Social Democratic History were published in 1897-1898, a scientific work better describing the history of the workers¡¯ movement, and the first historical work using the historical materialist viewpoint, the focus of the workers¡¯ movement as an object, which described the background, prerequisites, beginnings and scientific theory of the German workers¡¯ movement, the formation of the German Social Democratic Party, the activities of the German proletariat in the revolution of 1848 and the rise of the Lassalists, the establishment of the German Socialist Workers¡¯ Party, the Lassalists and Einstein in a series of major issues, the reasons for the merger of the two factions, and the problems and achiev

In the late nineteenth century, in the early twentieth century, the world entered the era of imperialism. In 1900, the imperialist coalition invaded China, and Melin revealed that the purpose of the imperialist forces was by no means to spread civilization, but to divide this largest sales market. He said that if German workers helped imperialism to forge the locks of enslaving the Chinese people, in 1906 the German Social Democratic Party decided to establish the Central Committee for Education and the School of the Party, Melin was elected as a member of the Committee for Education, and told the history of the German Workers' Movement and continued the struggle for revisionism at the German Party's Congress in Stuttgart and several subsequent meetings. Melin published many articles during this period against the revisionist attack on

The opportunists led by Kautsky held the New Age magazine, increasingly promoted revisionism, and secretly supported the imperialist war that was about to break out, Melin left the editorial office of the magazine in 1913 and refused to write for it. In August of the same year, Kautsky and others occupied the left-wing public opinion positions led by Melin, Luxembourg and others, the People's Daily, Melin did not succumb to the pressure of opportunist leaders, and in December 1913 he and Luxembourg opened new positions, founded the revolutionary throat of the Social Democratic Communications, and continued to fight with Kautskyism.

In the aftermath of the outbreak of the First World War, when the prisoners were banned, Carlin fought decisively for social chauvinism, which had appeared in the international co-operation, against the slogan of "defense of the motherland" put forward by the leaders of the conflicting countries, and in October, along with leftist leaders such as Ka Lipknezi, Melin wrote a letter to the Workers' Guide (The Weekly of Independent Social Democrats), calling on the proletarians of the whole world to join the working class against the war, and calling on the bourgeois against the imperialist war. On August 4, the same year, Merlin joined the emergency meeting of the Left Leader with Luther King, and decided to organize the anti-war campaign. In October, Melin also disclosed and criticized

After the October Revolution in Russia, he wrote songs praising the Bolsheviks and the Soviet regime. When the November Revolution broke out in Germany in 1918, Melin, although ill, continued to write articles revealing the right-wing social-democratic conspiracy to usurp the fruits of the revolution and propagate the political claims of the Spartakists. Melin believed that it was a mistake for the Spartakists to join the Independent Social-Democratic Party, and he actively advocated the separation of the Spartak Alliance from the Independent Social-Democratic Party. On December 26, 1918, the German Communist Party was founded, and Melin, although he was unable to participate in this historic meeting, the Congress sent a tribute to him, calling him "a loyal adviser and

In the course of his writing, Kautsky attempted to seize the great power of Marx's legacy, to collect material and to write and complete it, and it took more than thirty years to overcome opportunist interference, destruction, and disease torture. During the course of his writing, Kautsky attempted to seize the great power of Marx's legacy, and in the last year of his life, finally completed the five-hundred-thousand-word book of Marx's legacy, condemning his colleagues to publish articles on the New Age, condemning Melin's existence, saying Melin's "Anti-Marxism" and so on. Nevertheless, during his writing, Kautsky overcame the pressure of opportunism and enduringly fought with disease, and in the last year of his life,

On January 29, 1919, 73-year-old Vermelin died of pneumonia and his treatment was ineffective. The Marxist Translation was published only after his death. Lenin commented: "Merlin was not only a man willing to be a Marxist, but a man who was good at being a Marxist."