Shmitta

What is shimittat ksafim, when does it apply and what is the pruzbul?

The only logical explanation for the fierceness of haredi opposition to the heter mechira is that they associate it with Zionism

The heter mechira came about in the first shmitta year, 5649 (1888), after thousands of years in exile. Some opposing poskim changed their positions when they saw how urgent the situation was. Anti-Zionism caused more opposition.

Does the biblical prohibition in the title of the article contradict the application of heter mechira (selling land temporarily to a non-Jew during the shmitta year).