I was impressed by a little-known Slovak film called "Inferno" from 2014. It is a very dark movie about the grim post-socialist reality in Eastern Europe. It depicts all the problems - oligarchs, suppression, intimidation and subversion of leftists, collapse of social norms and social programs, extreme poverty etc.

https://www.imdb.com/title/tt3219106/

One more movie is Peepli [Live] from 2010 - an Indian movie depicting extreme poverty and suffering in rural India, as well as the indifference of more wealthy Indians to it.

https://www.imdb.com/title/tt1447508/

They Shoot Horses, Don't They? (1969) by Sidney Pollack. Desperate people participate in a cruel elimination show for the wealthy during the Great Depression. Maybe this film began the well-known now "death games" sub-genre, not sure. It was probably a new topic when the film came about.

https://www.imdb.com/title/tt0065088/

You probably know the recent "Parasite" (2019) movie. Not necessarily leftist, but it still depicts South Korean social tensions well

https://www.imdb.com/title/tt6751668/

Maybe it is off-topic, but I could also suggest a South Korean TV series "Good Manager" - drama/comedy. It depicts South Korean corporate corruption quite well and other problems of chaebol system. It has a social justice spirit, but it is not very strong. After all, being an open socialist in South Korea is dangerous, as I understand. Watching it was both fun and informative, however this is not concentrated materiel of course

https://www.imdb.com/title/tt6352982/

It is noticeable that in the capitalist world there are many anti-capitalist movies and they become more and more popular, but practically none pro-leninist movies (depicting the role of organizing, party as the vanguard of the revolution, dictatorship of the proletariat etc.) or movies depicting the people's control over economy/real people's democracy... when it comes to showing socioeconomic problems American movies become extremely primitive and absolutely never offer solutions (except the pro-systemic "the bad guy goes to jail" ending)

The Wind That Shakes The Barley

How to Blowup a Pipeline was based as fuck.

Hunger - about Bobby Sands’ hunger strike in prison.

Snowpiercer - badass

Parasite - one of the best movies ever made

Salo or 120 days of sodom - very gruesome and hard to watch. Only see it if you think you’re up for it. It’s an anti fascist movie made by a communist.

Fiddler on the Roof - has some mentions of the 1917 revolution lol

They Live - good critique of capitalism and how it shapes our realities

Starship Troopers - fascist satire

Che - no comment needed

Children of Men - the bleak future of capitalism

Sorry to Bother You - good, weird movie with a heavy dose of unionizing

Add some I haven't seen Machuca 2004 The Weather Underground 2002（Documentary about WUO) The Red Army/PFLP: Declaration of World War 1971

Lion of the Desert

Land and Freedom is a British film produced in England by an English director under a then-British production company. It is a super based movie about the anti-fascist struggle by the Spanish Republican forces and it glorifies leftist unity, Communism, and United anti fascism. All of the major characters are either communists or anarchists, the main protagonist being an English Communist, and there is literally a scene where they sing L’Internationale in Spanish.

Also the formerly banned documentary style movie Native Land narrated by famous African American communist singer and actor Paul Robeson is pretty based. McCarthyists immediately banned it and all major media outlets in the us denounced it as propaganda.

I am surprised no one mentioned "Sorry to Bother you?"

Marighella is a Brazilian film about Carlos Marighella who was an ML that wrote a book on urban warfare.

A few of my favs:

• Pride (2014)
• Reds (1981)
• Salt of the Earth (1954)
• Matewan (1987)
• The Spook who sat by the door (1973)
• The Proud Valley (1940)
• The Young Karl Marx (2017)
• Network (1976)
• The Hospital (1971)
• Burn! (1969)
• Trumbo (2015)

Reds (1981)

i'm a big fan of Ken Loach, sometimes not overtly leftist but always working class-oriented. Plus the guy was super nice when we got the chance to meet him so i like him on a personal level.