Mathematics and politics. Whom else can I remember? Ah! Galois. Do you remember more mathematicians who were also very involved in politics and other subjects which are (mostly) unrelated with maths?
"Grothendieck's political views were radical and pacifist, and he strongly opposed both United States intervention in Vietnam and Soviet military expansionism. He gave lectures on category theory in the forests surrounding Hanoi while the city was being bombed, to protest against the Vietnam War"
Contemporanean one: Cedric Villani, Fields medallist and french deputy on the parliament.