I'd argue politics has probably always been just as corrupt, if not more corrupt than it is now. We just know about it because they found out that when exposed the average person just doesn't care.
Id say the most successful attempt in the US was the OWS movement, given how quickly it was brought down.
But occupy had the feds working with local LEOs with a supposed "kill list" to "take out leadership.
They remodeled the front steps of the SF fed reserve due to them, and we're working with Oakland pd on how to deal with the protests and wound up planting agent provacatuers in the midsts to foment vandalism and sway public opinion against ows.
But I am not familiar with what the ones you mentioned accomplished with respect to influence. Interested to know.
-- https://en.wikipedia.org/wiki/Weather_Underground
There are a number of books about the group (some by former members) that are worth reading, and there's also a documentary: