The Russian immigrants spoke Russian.
The proper adjective for Russian is "Russian."
The Russian word for "Russian" is русский, pronounced ROOS-ski. If you want to write it in English, you can write it as russky.
In Russian, 'Russian' is pronounced as 'русский' (ruskiy).
In Russian, "no" is written as "нет".
Marc Chagall
The Russian battleship 'Potemkin, is the naval vessel whose crew mutinied on June 14, 1905.
Karl Marx
Trotsky?
You may be thinking of 20th century Russian composer Alfred Garyevich Schnittke (in Russian - Альфре́д Га́рриевич Шни́тке).
Vladimir I Lenin.
Lenin’s teachings on leadership and dictatorship.
Tsar Alexander I
Catherine the Great
Yuri Gagarin was a Russian astronaut. He was the 1st person in space.
He married Gala, whose real name was Elena Ivanovna Diakonova. She was a Russian immigrant.
Tsar Alexander 1