The event was called the Great Purge. Several Soviet officials and high ranking people were arrested during this event. Some were even executed.
It would be mainly that "<span>D. More than one person wishes to control the same piece of land" that generally </span>has been the main cause of land grant disputes over time, since land is of course limited and very valuable.
<span>Creo que la respuesta es PNR o PRM.</span>