The alliance is often based on common left political views, especially a shared distrust of corporate or capitalist institutions.
While the "red" social-democratic parties tend to focus on the effects of capitalism on the working class, the "green" environmentalist parties tend to focus on the environmental effects of capitalism.
A red–red–green coalition or red–green–red coalition is a left-wing alliance of two "red" social democratic, democratic socialist, or socialist parties with one "green" environmentalist party.
In France, Jean-Luc Mélenchon's New Ecologic and Social People's Union is an example of a left–green alliance.
[1][2] Political parties or joint electoral lists have been formed over the years, most often between socialists and left-oriented greens.