When the Council of Churches was formally set up as an underground body in 1965, Vins became its General Secretary. Hundreds of the movement's followers were already in prison. In a dramatic protest, Baptists converged from all over the Soviet Union for a mass demonstration outside the Central Committee building in Moscow. Several days later, Vins went to the Central Committee with other leaders to ask about the fate of those who had been detained at the unprecedented demonstration. As a result, they were themselves arrested. Vins and the Chairman of the Council of Churches, Gennady Kryuchkov, went on trial in November 1966 and he was sentenced to three years imprisonment. His wife Nadezhda was left to look after their four children.