After the 1973 Old Bailey (IRA) bombing, Redgrave volunteered to post bond for the defendants and offered up her own house in West Hampstead, should any of them need a place to stay. None of the defendants were released from custody to take her up on her offer.

In 1980, Redgrave made her American TV debut as concentration camp survivor Fania Fénelon in the Arthur Miller-scripted TV movie Playing for Time, a part for which she won an Emmy as Outstanding Lead Actress in 1981. The decision to cast Redgrave as Fénelon was, however, a source of controversy. In light of Redgrave’s support for the Palestine Liberation Organization (PLO), Fénelon herself and the Jewish groups the Simon Wiesenthal Center, the Anti-Defamation League, and the American Jewish Congress objected to Redgrave’s casting. Rabbi Marvin Hier of the Simon Wiesenthal Center wrote in a telegram that, “Your selection shows utter callous disregard of the tens of thousands of survivors for whom Miss Redgrave’s portrayal would desecrate the memory of the martyred millions. Your decision could only be compared to selecting J. Edgar Hoover to portray Martin Luther King Jr.” Producer David L. Wolper in a telephone interview compared it to letting the head of the Ku Klux Klan play a sympathetic white man in Roots, a miniseries about the slave trade. Arthur Miller said “She’s a Marxist; this is a political matter. Turning her down because of her ideas was unacceptable to me; after all I suffered the blacklist myself”.

from her wiki page, there’s other cool stuff too, but these jumped out

https://en.wikipedia.org/wiki/Vanessa_Redgrave#Political_activism