Premise: Adolf Hitler . He joined the German Workers ' Party ( DAP ) , the precursor of the NSDAP , in 1919 and became leader of the NSDAP in 1921 . The chairman ( also chairperson , chairwoman or chair ) is the highest officer of an organized group such as a board , a committee , or a deliberative assembly .
Hypothesis: Adolf Hitler became the chairman of the NSDAP in 1921.
Label: ENTAILMENT