Following the failed Hamburg Uprising and Bulgarian September Uprising, the Estonian authorities decided to crack down on the small but very militant Estonian Communist Party. On 21 January 1924, the security police raided a club called "The Workers' Cellar" ("Tööliste kelder") where 185 representatives of workers' organisations had gathered for a meeting. The names of people present were recorded and the chairmen of the meeting – Hendrik Allik, Paul Keerdo and Jaan Tomp – were arrested. That same day, Vladimir Kangur was arrested in Narva. They all were accused of being the founders of the Workers' United Front ("Töörahva Ühine Väerind"). Several members of the Riigikogu also belonged to this organisation.