Invited by the Czartoryskis, the Russian forces entered the country and helped "Familia" to put the Convocation Sejm of 1764 under its control (Adam Kazimierz Czartoryski was the Marshal of the Sejm). The resistance of the "Republican" faction led by Hetman Branicki and Karol Radziwiłł was overcome and the opposition leaders had to leave the country. Andrzej Zamoyski then presented a program of constructive reforms, that included the majority rule in parliament, establishment of a permanent executive council (as recommended by Stanisław Konarski) and turning of the Republic's highest offices into collective organs. Frederick II and Prussian diplomats in cooperation with St. Petersburg and "szlachta" opposition were able to thwart much of the planned reform. The partial reforms pushed through with Catherine's support were still significant and constitute the beginning of the "enlightened" period, when the Polish-Lithuanian state attempted to adopt a variety of long overdue measures and thus save its existence. Parliamentary rules were made more functional, deputies were no longer bound by instructions issued by the local assemblies that delegated them ("sejmiks"), majority voting was imposed in matters involving the treasury and economics (which weakened the unanimity requirement enforced thus far by the "liberum veto" procedure). Military (hetman) and treasury highest officers were assigned respective parliamentary commissions that limited their power. The reform of matters important for the urban burgher class was also undertaken and included elimination of private customs and introduction of general customs, as well as partially limiting "jurydykas".