Today in Labor History March 13, 1968: Student demonstrations in Warsaw led to street riots. All Polish universities went out on strike against the repressive communist regime, with students occupying the campus buildings. The strike, which came in the wake of Soviet withdrawals of diplomatic relations with Israel, in the protest of the 1967 war, spread throughout the country, leading to a violent government crackdown and antisemitic purge that was branded as anti-Zionism. Thousands of Jews fled the country because of political harassment and being fired from their jobs.