"Mundo Obrero" was first published on 14 November 1931.
 During its initial phase the paper was edited by Peruvian journalist César Falcón and was financed by the Soviet Union.
 Its headquarters is in Madrid.
 One of its notable contributors was Dolores Ibárruri.
 Its editor-in-chief was Jesus Hernández on the outbreak of the Spanish Civil War.
 The paper was illegally published during the rule of Franco.
The World Committee Against War and Fascism was an international organization that was active in the struggle against Fascism in the 1930s.
 During this period Adolf Hitler came to power in Germany, Italy invaded Ethiopia and the Spanish Civil War broke out.
 Although some of the women involved were Communists whose priority was preventing attacks on the Soviet Union, many prominent pacifists with different ideologies were members or supporters of the committee.
 The World Committee sponsored subcommittees for Women and Students, and national committees in countries that included Spain, Britain, Mexico and Argentina.
 The Women's branches were particularly active and included feminist leaders such as Gabrielle Duchêne of France, Sylvia Pankhurst of Britain and Dolores Ibárruri of Spain.
Isidora Dolores Ibárruri Gómez (9 December 189512 November 1989) – known as "La Pasionaria" (English: "the Passionflower") – was a Spanish Republican heroine of the Spanish Civil War and communist politician of Basque origin, known for her famous slogan "¡No Pasarán!"
 ("They shall not pass") during the Battle for Madrid in November 1936.
"We Bring Good Things to Life" was an advertising slogan used by General Electric between 1979 and 2003.
 It was designed by the advertising firm BBDO led by project manager Richard Costello, who would later go on to become head of advertising at General Electric.
 The slogan was designed to highlight the diversity of the products and services the company offered.
 The slogan, after its many appearances in GE advertising, was responsible for increased popularity and a new image for the company.
Pakistan Zindabad (Urdu: ‎ — "Pākistān Zindah bād" , ; "lit."
 "Long Live Pakistan") is a slogan used by Pakistanis as an expression of victory or patriotism, often used in political speeches.
 Its use started even before the creation of Pakistan, during the later phase of the Pakistan Movement.
 The slogan became a battle cry and greeting for the Muslim League, which was struggling for an independent country for the Muslims of South Asia, when World War II ended and the independence movement geared up.
 During the struggle for independence the slogan was shouted when trains transporting Muslims entered Pakistan.
 "Pakistan Zindabad" is also the National slogan of Pakistan.
Irene Falcón Rodríguez (1908 – 19 August 1999) was a Spanish journalist, feminist, pacifist and Communist activist.
 For many years she was the assistant of Dolores Ibárruri, leader of the Spanish Communist Party, and she is best known for this role.
 After the Spanish Civil War she was forced into exile in Moscow and Beijing.
 She returned to Spain after the return to democracy in 1977.
"They shall not pass" (French: "Ils ne passeront pas!"
 ; Spanish: "¡No pasarán!" )
 is a slogan used to express determination to defend a position against an enemy. "
"On ne passe pas "" literally means "one does not pass"; this being a common French idiom to express interdiction.
Rubén Ruiz Ibárruri (January 9, 1920 - September 3, 1942) was the son of Spanish communist leader Dolores Ibárruri and a posthumous Hero of the Soviet Union.
"Kosovo je Srbija" (; English: Kosovo is Serbia ) is a slogan used in Serbia since at least 2004, popularised as a reaction to Kosovo's declaration of independence from Serbia on 17 February 2008.
 The slogan has been used by a series of protests, and by the Serbian Government.
 The slogan has appeared on T-shirts and in graffiti and was placed on the websites of Kosovan institutions by hackers in 2009.
 The slogan is used by Serbians, Russians and Greeks across the world.
Francisco Antón Sanz (1906 – 14 January 1976) was a Spanish communist leader.
 He is known as the lover of Dolores Ibárruri during and after the Spanish Civil War (1936–39).

Question: Dolores Ibárruri is famous for a slogan used to express what?
Answer: determination to defend a position against an enemy