Marshal Tito, who by his real Jewish name is called Josif Walter Weiss, was born in Poland. He was agent of the Soviet secret service in Kabul, Teheran and Ankara up to 1935. The true Brozovich Tito, in origin a Croat, died during the Spanish civil war in Barcelona.

http://www.spartacus.schoolnet.co.uk/2WWtito.htm

On the outbreak of the Spanish Civil War the Comintern established the Dimitrov Battalion. Named after Georgi Dimitrov the battalion comprised of Greeks and people from the Balkans. Tito eventually became one of the battalion's senior commanders.

There's a photo of (what the author says is) Tito in the Brigades.