Question: Metro Tlatelolco is famous for a massacre that was considered part of what suppression of political opposition?

Context paragraphs:
Mineral industry of Guatemala: There is a political opposition in Guatemala to mining, particularly open pit mining, financed by international organizations.  Opposition is based on both environmental concerns and opposition to globalization.  The indigenous Maya peoples organizations have been extremely active in opposing international mining projects despite government support of them.

List of political parties in the Gambia: This article lists political parties in the Gambia.  The Gambia is a one party dominant state with the Alliance for Patriotic Reorientation and Construction in power.  Opposition parties are allowed, but are widely considered to have no real chance of gaining power.  In 2005 five opposition parties, virtually the entire political opposition in the country, formed a common umbrella called the National Alliance for Democracy and Development.

National Front for the Salvation of Libya: The National Front for the Salvation of Libya (NFSL) was a political opposition group active during the rule of the Gaddafi regime in Libya.  It was formed in 1981 and called for major liberalising reforms such as democratic elections, a free press, and the separation of powers.  During the 1980s, it pursued a campaign of armed opposition to the Gaddafi regime and made several coup attempts, the most notable being its 1984 armed assault on Gaddafi's Bab al-Azizia compound in Tripoli.  After the failure of this and several other coup attempts the group largely abandoned militancy, and instead used peaceful tactics to promote reform in Libya; in 2005, the NFSL joined with six other groups to form the National Conference for the Libyan Opposition.

United Nationalist Democratic Organization: The United Nationalist Democratic Organization (UNIDO) was the main political multi-party electoral alliance of the traditional political opposition during the turbulent last years of Philippine President Ferdinand Marcos in the mid-1980s.  It was formed in January 1980, and was originally known as the United Democratic Opposition from 1980 to 1982.  It was initially a union of eight major and minor political parties and organizations with the main aim to oust President Marcos through a legal political process.  In April 1982, the coalition changed its name to United Nationalist Democratic Organization, and increased its members to twelve parties.  Shortly after the assassination of popular oppositionist Senator Benigno Aquino, Jr., the party was led by Senator Salvador Laurel of Batangas.

New Progressive Party (Puerto Rico): The New Progressive Party (NPP) —Spanish: "Partido Nuevo Progresista" (PNP)— is a political party in Puerto Rico that advocates for the island to become a state of the United States.  The PNP is one of the two major parties in Puerto Rico with significant political strength and currently holds both the seat of the governor and of the resident commissioner.  In legislative matters, the party has a two-thirds majority in both the Senate and the House of Representatives; a majority that gives the party full control over all legislations, including constitutional amendments, without political opposition.  These majorities over the legislative branch, the control over the governorship seat, and a majority of Supreme Court justices affiliated with the party give the PNP absolute control over all three branches of government without political opposition.  The party, however, has a minority in the number of mayors on the island.

Soviet anti-religious legislation: The government of the Soviet Union followed an unofficial policy of state atheism, aiming to gradually eliminate religious belief within its borders.  While it never officially made religion illegal, the state nevertheless made great efforts to reduce the prevalence of religious belief within society.  To this end, at various times in its history it engaged in anti-religious persecutions of varying intensity and methodology.  Believers were never officially attacked for being believers, but they were officially attacked for real or perceived political opposition to the state and to its policies.  These attacks, however, in the broader ideological context were ultimately meant to serve the ultimate goal of eliminating religion, and the perceived political opposition acted as a legal pretext to carry this out.  Thus, although the Soviet Union was officially a secular state and guaranteed freedom of religion in its constitutions, in practice believers suffered discrimination and were widely attacked for promoting religion.

Tlatelolco massacre: The Tlatelolco massacre was the killing of an estimated 300 to 400 students and civilians by military and police on October 2, 1968, in the Plaza de las Tres Culturas in the Tlatelolco section of Mexico City.  The events are considered part of the Mexican Dirty War, when the government used its forces to suppress political opposition.  The massacre occurred roughly 10 days before the opening of the 1968 Summer Olympics in Mexico City.  More than 1,300 people were arrested by security police.  There has been no consensus on how many were killed that day in the plaza area.

Metro Tlatelolco: Metro Tlatelolco is a metro station along Line 3 of the Mexico City Metro.  It is located in the Tlatelolco neighbourhood of the Cuauhtémoc borough of Mexico City, to the north of the downtown area.  It serves the Unidad Habitacional Nonoalco-Tlatelolco mega apartment complex, famous for its Plaza de las Tres Culturas square (with buildings from the pre-Hispanic, colonial, and modern eras) and infamous for the 1968 Tlatelolco massacre of demonstrating students.

Opposition (parliamentary): Parliamentary opposition is a form of political opposition to a designated government, particularly in a Westminster-based parliamentary system.  This article uses the term "government" as it is used in Parliamentary systems, i.e. meaning "the administration" or "the cabinet" rather than "the state".  The title of "Official Opposition" usually goes to the largest of the parties sitting in opposition with its leader being given the title "Leader of the Opposition".

Elena Poniatowska: Elena Poniatowska    (born May 19, 1932) is a French-born Mexican journalist and author, specializing in works on social and political issues focused on those considered to be disenfranchised especially women and the poor.  She was born in Paris to upper class parents, including her mother whose family fled Mexico during the Mexican Revolution.  She left France for Mexico when she was ten to escape the Second World War.  When she was eighteen and without a university education, she began writing for the newspaper "Excélsior", doing interviews and society columns.  Despite the lack of opportunity for women from the 1950s to the 1970s, she evolved to writing about social and political issues in newspapers, books in both fiction and nonfiction form.  Her best known work is "La noche de Tlatelolco" ("The night of Tlatelolco", the English translation was titled "Massacre in Mexico") about the repression of the 1968 student protests in Mexico City.  She is considered to be “Mexico's grande dame of letters” and is still an active writer.

Supporting paragraphs: Metro Tlatelolco Tlatelolco massacre
Answer: Mexican Dirty War