Boycott means breaking off trade relations with a country, company, or an individual. The reasons might be political in nature, based on revenge, or for the purpose of isolation.
On 1 April 1933, Goebbels announced that Nazi Germany will officially boycott Jewish shops, doctors, and lawyers. Ten days later, any civil servant who had more than one Jewish grandparent was fired. A similar series of anti-Jewish measures (ordinances) drove the Jews from their professional occupations, business, schools, recreational facilities, and cultural institutes. Step by step they were isolated from the rest of the population.