Dadaism, an avant-garde movement that emerged during World War I, was characterized by its anti-art stance, rejection of traditional aesthetics, and use of satire and absurdity to critique the political and social conditions of the time.

Rivera's mural 'Man at the Crossroads' caused controversy due to its inclusion of a portrait of Lenin and other communist symbols. The mural was commissioned for the Rockefeller Center in New York City but was ultimately destroyed due to its political content.

Ai Weiwei is a Chinese contemporary artist and activist known for his politically and socially engaged work. His installations, sculptures, and performances often address issues of human rights, freedom of expression, and the relationship between the individual and the state.

The Guerrilla Girls focus on exposing gender inequality in the art world, particularly the underrepresentation of women artists in museums, galleries, and art history books.

Jasper Johns is an American artist known for his paintings, sculptures, and prints that often incorporate elements of protest and political commentary. His work frequently includes flags, maps, and historical imagery, exploring themes of identity, memory, and the relationship between art and politics.

Fluxus was an international artistic movement that emerged in the 1960s and 1970s. It was characterized by its anti-art stance, emphasis on ephemerality, and use of everyday objects and materials. Fluxus artists often engaged in performances, happenings, and other forms of artistic expression that challenged traditional notions of art and explored the relationship between art and politics.

Kara Walker is an American artist known for her silhouettes and other works that explore issues of race, identity, and social justice. Her work often references historical events and imagery, addressing themes of slavery, racism, and the ongoing struggle for racial equality.

Ai Weiwei's installation 'Remembering' consisted of thousands of backpacks, each representing a child who died in the 2008 Sichuan earthquake. The backpacks were displayed in various locations, including the facade of the Tate Modern in London, as a memorial to the victims and a protest against the government's handling of the disaster.

Jenny Holzer is an American artist known for her use of text and public art to explore themes of power, control, and surveillance. Her work often consists of LED signs, projections, and other forms of text-based art that address issues such as gender inequality, political corruption, and the impact of technology on society.

Hans Haacke is a German artist known for his institutional critique, which involves examining and critiquing the structures and institutions that govern the art world. His work often involves installations, performances, and other forms of artistic expression that challenge the traditional notions of art and its relationship to power and authority.

Jasper Johns is an American artist known for his paintings, sculptures, and prints that often incorporate elements of protest and political commentary. His work frequently includes flags, maps, and historical imagery, exploring themes of identity, memory, and the relationship between art and politics.

Fluxus was an international artistic movement that emerged in the 1960s and 1970s. It was characterized by its anti-art stance, emphasis on ephemerality, and use of everyday objects and materials. Fluxus artists often engaged in performances, happenings, and other forms of artistic expression that challenged traditional notions of art and explored the relationship between art and politics.

Kara Walker is an American artist known for her silhouettes and other works that explore issues of race, identity, and social justice. Her work often references historical events and imagery, addressing themes of slavery, racism, and the ongoing struggle for racial equality.

Ai Weiwei's installation 'Remembering' consisted of thousands of backpacks, each representing a child who died in the 2008 Sichuan earthquake. The backpacks were displayed in various locations, including the facade of the Tate Modern in London, as a memorial to the victims and a protest against the government's handling of the disaster.

Jenny Holzer is an American artist known for her use of text and public art to explore themes of power, control, and surveillance. Her work often consists of LED signs, projections, and other forms of text-based art that address issues such as gender inequality, political corruption, and the impact of technology on society.