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Regional defence council of aragon wrote:

Trade Unions partook in administion, collectivization and formation of militias. The Anarachist trade unions: CNT and FIA, along with the socialist trade union: UGT had an active role in the revolution. Revolutionary Catalonia was practically controlled by trade unions.

The CNT wasn’t just a trade union, it played a large role in the revolution because it was literally part of the republican government and held ministries. The UGT also kept itself legal within Spain, it did not take part in the revolution and instead held a collaborative attitude with the dictatorship.