Yes, yes, yes. The Nazis killed off about two thirds of the gypsy population they encountered in Germany and Eastern Europe.
They also killed Russians, Ukrainians, Poles, homosexuals, Czechs, Slavs, Catholics (who didn't adhere to Nazi standards), mentally and physically handicapped, Jehovah's Witness, Communists... um that's pretty much all the people they targeted ahead of time.
Gypsy deaths may have totaled about 200,000 out of a total of 300,000 living in Europe -- 15,000 of the 20,000 Gypsies in Germany in 1939 were dead by the end of the war while the ones married to Germans were sterilized. They were gassed, worked to death, starved, shot, or died of disease and neglect (same as the Jews). Gypsy and all the rest were not in synch with the Aryan ideal of racial purity. The handicapped were considered defective but not in the sense of Friedrich Nietzsche's "botched and bungled" as some people claimed later. Hitler just saw all these people as a burden on society... except the Jews. Hitler may have been Jewish himself -- little is known of his father and his mother worked for a Jewish family (so he may have been the son of a Jewish father). He had his childhood hometown destroyed and used as an artillery range to further eliminate any trace of his history. And Hitler needed a convenient scape goat for the German people's troubles (which stemmed primarily from the terms of the Versaille Treaty authored in large part by France's Clemenceau). The world was in a massive depression (not just the US) and inflation was rampant as the German's Weimer government merely printed Reichsmarks (replaced by the Deutsche Mark in 1948) to pay war retributions to France and England. Many Jews were involved in banking and Hitler saw these as an easy target... "it's their fault we're broke and have no pride..." Which was a total fabrication