Lech Wałęsa jumped a fence on this date in 1980

On 14 August 1980, after another food-price hike led to a strike at the Lenin Shipyard in Gdańsk—a strike of which he was one of the instigators—Wałęsa scaled the shipyard fence and, once inside, quickly became one of the strike leaders.

The Solidarność strikes eventually brought down the Soviet Union.

Good job, Poland.