Hitler increased the power of swastika by placing it on the Nazi party flag (which subsequently became the official flag of Nazi Germany). The flag was with a red background, a white disk and a black swastika (slightly shifted to the left) in the middle.
He chose red, black and white colors primarily for continuity (these were the colors of the flag of the Second Reich). However, it also happens to be the most emotionally powerful color combination. An amazing coincidence… or not a coincidence at all.
Adolf Hitler stated:
“As National Socialists, we see our program in our flag. In red, we see the social idea of the movement; in white, the nationalistic idea; in the swastika, the mission of the struggle for the victory of the Aryan man, and, by the same token, the victory of the idea of creative work.”