Thälmann helped to organise the Hamburg Uprising of October 1923—it failed, however, and Thälmann was forced to go in hiding. After Lenin's death in late January 1924, Thälmann visited Moscow and maintained a guard of honour at his bier. From February 1924 he was deputy chairman of the KPD and, from May, a Reichstag member. At the 5th Congress of the Comintern in July 1924 he was elected to the Comintern executive committee and a short time later to its steering committee. In February 1925 he became chairman of the KPD's paramilitary organisation, the "Roter Frontkämpferbund" (RFB) (although this organisation was banned as an extremist organisation by the governing social democrats in 1929, after the events of Blutmai ("Bloody May", see below)). In October 1925 Thälmann became chairman of the KPD and thus a candidate for the German Presidency. Thälmann's candidacy in the second round of the presidential election split the centre-left vote, ensuring that the conservative Paul von Hindenburg defeated the Centre Party's Wilhelm Marx.