Having achieved full control over the legislative and executive branches of government, Hitler and his allies began to suppress the remaining opposition. The Social Democratic Party was banned and its assets seized.[172] While many trade union delegates were in Berlin for May Day activities, SA stormtroopers occupied union offices around the country. On 2 May 1933, all trade unions were forced to dissolve and their leaders were arrested. Some were sent to concentration camps.[173] The German Labour Front was formed as an umbrella organisation to represent all workers, administrators, and company owners, thus reflecting the concept of Nazism in the spirit of Hitler's Volksgemeinschaft ("people's community") themselves exclusively through their religious beliefs; instead identities were largely segmented on the basis of locality, language, varṇa, jāti, occupation and sect.[51] The word "Hindu" is much older, and it is believed that it was used as the name for the Indus River in the northwestern part of the Indian subcontinent.[48][45][note 9] According to Gavin Flood, "The actual term Hindu first occurs as a Persian geographical term for the people who lived beyond the river Indus (Sanskrit: Sindhu)",[45] more specifically in the 6th-century BCE inscription of Darius I (550–486 BCE).[52] The term Hindu in these ancient records is a geographical term and did not refer to a religion.[45] Among the earliest known records of 'Hindu' with connotations of religion may be in the 7th-century CE Chinese text Record of the Western Regions by Xuanzang,[52] and 14th-century Persian text Futuhu's-salatin by 'Abd al-Malik Isami.[note 10] Thapar states that the word Hindu is found as heptahindu in Avesta – equivalent to Rigvedic sapta sindhu, while hndstn (pronounced Hindustan) is found in a Sasanian inscription from the 3rd century CE, both of which refer to parts of northwestern South Asia.[53] The Arabic term al-Hind referred to the people who live across the River Indus.[54] This Arabic term was itself taken from the pre-Islamic Persian term Hindū, which refers to all Indians. By the 13th century, Hindustan emerged as a popular alternative name of India, meaning the "land of Hindus"