hitler's greatest threat was ernest röhm (leader of the SA). however, he was also worried about other members of the nazi party, in late june of 1934, he sent men to arrest and kill röhm, alongside other leaders of the SA & senior politicians. hitler claimed that those killed were plotting to overthrow the government, which made it legal. this eliminated potential opposition within the nazi party, sending a message of hitler's brutality and how he is above the law.