Andres Nin

Nin (along with Joaquin Maurin) formed the Workers' Party of Marxist Unification (POUM) in 1935 as a Trotskyist communist alternative to the Third International loyalist Communist Party of Spain.

After the Spanish Popular Front won the 1936 election Nin became councillor of justice. He supported the government but was far more radical than most of its members.

Nin later joined the devolved government in Catalonia, headed by Luis Companys but owing to Soviet demands was removed from office along with other POUM appointees.

Nin was unpopular with the Soviet government of Josef Stalin owing to his support of Leon Trotsky (indeed Nin had been Trotsky's secretary at one stage).

In June 1937 Nin and most of the leadership of POUM were arrested and sent to a Soviet camp near Madrid. Andrés Nin was executed on June 20, 1937.