Original sentence: Officially their aim was to defend perestroika against reactionary elements within the state bureaucracy, but over time they began to question the legitimacy of their republics' membership of the USSR.Trotsky believed that only united fronts could ultimately be progressive, and that popular fronts were useless because they included non-working class bourgeois forces such as liberals
Edited sentence: , An Open Letter to American Liberals, Soviet Russia Today (March 1937)</ref>Additionally, Trotsky believed that only united fronts could ultimately be progressive, and that popular fronts were useless because they included non-working class bourgeois forces such as liberals.<ref name="Lamont, Corliss 1937">Lamont, Corliss et al.In the first place, Stalin had used the Popular Front as a tool to oppose Trotsky and other dissidents outside Stalin's immediate control.Officially their aim was to defend perestroika'' against reactionary elements within the state bureaucracy, but over time they began to question the legitimacy of their republics' membership of the USSR.ca:Front Popular.de:Volksfront.eo:Popola Fronto.es:Frente Popular.fi:Kansanrintama.gl:Fronte Popular.hu:Népfront (egyértelműsítő lap).it:Fronte popolare.ja:人民戦線.nl:Volksfront.pl:Front Ludowy.pt:Frente Popular.ru:Народный фронт.sv:Folkfront.tr:Halk cephesi.uk:Народний фронт