" Then he was not a professional criminal" ?

“那他不是职业罪犯”？

In the past, people who were professional criminals often dressed in fancy clothing to hide the fact that they were doing horrible things.

过去，专业的罪犯总是穿着光鲜亮丽的衣服，用以掩盖他们在做坏事。

Although, if you remember the 1920s and 30s in the United States, and ever saw any of the movies about the " gangsters, " people who were professional criminals, sometimes in the movies you see them with machine guns.

虽然，如果你还记得 1920 年代和 30 年代的美国，并且曾经看过任何关于“黑帮” 的电影，这些人是职业罪犯， 有时你会在电影中看到他们拿着机枪。