The Democratic Socialists has had many socialist and anti-capitalist activists and groups in it since Bernie’s run for president. There are also still activists and groups doing their own thing independent of the democratic party. The Greens are still around, have adopted an ecosocialist platform and have a considerable number of registered voters. That being said I think their members’ political leaning and activity varies wildly from place to place and the momentum is with the Democratic Socialists these days.