more severe measures ranged from banishment to the Gulag labour camps to execution after trials held by NKVD troikas. In the 1930s, Stalin became increasingly worried about the growing popularity of the Leningrad party head Sergei Kirov. At the 1934 Party Congress, where the vote for the new Central Committee was held, Kirov received only three negative votes (the fewest of any candidate), while Stalin received at least over a hundred negative votes. After the assassination of Kirov, which Stalin may have orchestrated, Stalin invented a detailed scheme to implicate opposition leaders in the murder, including Trotsky, Lev Kamenev, and Grigory Zinoviev. From thereon, the investigations and trials expanded. Stalin passed a new law on "terrorist organizations and terrorist acts" that were to be investigated for no more than ten days, with no prosecution, defence attorneys, or appeals, followed by a sentence to be executed "quickly." After that, several trials, known as the Moscow Trials, were held, but the procedures were replicated throughout the country. Article 58 of the legal code, which listed prohibited anti-Soviet activities as a counter-revolutionary crime, was applied most broadly. Many alleged anti-Soviet pretexts were used to brand individuals as "enemies of the people", starting the cycle of public persecution, often proceeding to interrogation, torture, and deportation, if not death. The Russian word troika thereby gained a new meaning: a quick, simplified trial by a committee of three subordinated to the NKVD troika—with sentencing carried out within 24 hours. Stalin's hand-picked executioner Vasili Blokhin was entrusted with carrying out some of the high-profile executions in this period. Many military leaders were convicted of treason, and a large-scale purge of Red Army officers followed. The repression of many formerly high-ranking revolutionaries and party members led Leon Trotsky to claim that a "river of blood" separated Stalin's regime from that of Lenin. In August 1940, Trotsky was assassinated in Mexico, where he had lived in exile since January 1937—this eliminated the last of Stalin's opponents among the former Party leadership. Except for Vladimir Milyutin (who died in prison in 1937) and Stalin himself, all of the members of Lenin's original cabinet who had not succumbed to death from natural causes before the purge were executed. Mass operations of the NKVD also targeted "national contingents" (foreign ethnicities) such as Poles, ethnic Germans, and Koreans. A total of 350,000 (144,000 of them Poles) were arrested and 247,157 (110,000 Poles) were