Match these items .

1 .
Mikhail Gorbachev
President, Congress, Supreme Court
2 .
checks and balances
Chi Rho cross
3 .
Constantine I
Reform in the USSR
4 .
Early Europeans
Austria-Hungary
5 .
Warsaw
Karl Marx
6 .
Dual Monarchy
Poland's capital
7 .
five-year plans
Stalin
8 .
Russia's religion
Orthodox
9 .
Zagreb
Croatia's capital
10 .
communism
Slavs