Numerous acts of vandalism and desecration were perpetrated as a reaction the the court ruling.
The decision halts "pregnancy terminations" for foetal abnormalities, virtually the only type currently performed in the country.
Poland maintains strict abortion laws, only allowing it in cases of rape, incest, or when a mother’s life is in danger.
In late June, a vehicle from the Polish Right to Life organisation was targeted by a vandal describing himself as transgender.
The fake news about the alleged existence of so called "LGBT-free zones" in Poland has gone viral in the last months.
Mostly young people took part in the march, but there were also families with children.
The Pole was accused by the security services of participating in an "illegal street action."
The Soviets were Hitler's biggest allies between 1939 and 1941. They are responsible for the death of tens of millions of people.
The cost of the monument is over one million U.S. dollars.