Why did nazi prisoners wear a second badge

Criminals were marked with green inverted triangles, political with red, "asocials" with black or in the case of Roma in some camps brown triangles. Homosexuals were identified with pink triangles and Jehovah's Witnesses with purple. Non- German prisoners were identified by the first letter of the German name for their home country, which was sewn into their badge. The two triangles forming the Jewish star would both be yellow unless the Jewish prisoner was included in one of the other prisoner categories. A Jewish political prisoner for example would be identified with a yellow triangle under a red triangle. 

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.