Strike of the 100,000
It was led by Julien Lahaut , head of the Belgian Communist Party ( "Parti Communiste de Belgique" or PCB ) , even though the Nazi—Soviet Pact was still in force . 
<triplet> Julien Lahaut <subj> Belgian Communist Party <obj> member of political party <triplet> Belgian Communist Party <subj> Julien Lahaut <obj> founded by