Johann Georg Eccarius was a Thuringia

Thuringia

The Free State of Thuringia is a state of Germany, located in the central part of the country.It has an area of and 2.29 million inhabitants, making it the sixth smallest by area and the fifth smallest by population of Germany's sixteen states....

n tailor and labour activist. He was a member of the League of the Just and later of the League of Communists and the International Workingmen's Association

International Workingmen's Association

The International Workingmen's Association , sometimes called the First International, was an international organization which aimed at uniting a variety of different left-wing socialist, communist and anarchist political groups and trade union organizations that were based on the working class...

. Here he served jointly with Marx on General Council for a number of years. Following quarrels with Marx in 1872, he joined the English trade union

Trade union

A trade union, trades union or labor union is an organization of workers that have banded together to achieve common goals such as better working conditions. The trade union, through its leadership, bargains with the employer on behalf of union members and negotiates labour contracts with...

 movement. In the late 1870s, he was active in the Manhood Suffrage League

Manhood Suffrage League

The Manhood Suffrage League was a nineteenth century ultra-radical and, later, socialist club.The organisation was founded in 1874 as the Democratic and Trades Alliance Association...

.