The First All-Ukrainian Congress of Workers was held in May 1918, bringing together 300 delegates who represented 311 trade unions which claimed a total of more than 500,000 members.
The congress also established the country's first national trade union federation.
[1] By April 1919, the Bolsheviks were in control of the Ukrainian trade union movement.
That month, they convened the First All-Ukrainian Trade Union Congress in Kharkov, which dissolved Utsentrprof.
In 1924, a second congress was held, which established a successor, the All-Ukrainian Council of Trade Unions.