This is the first strike by ILA union longshoremen in 47 YEARS.

Notice that the The International Longshoremen’s Association equates to 474.

https://www.cnbc.com/2024/10/01/east-coast-ports-strike-ila-union-work-stop-billions-in-trade.html

As for 14 ports going on strike, the organization was originally known as LUPA (LUPA=14).