sentences:  However, Tatla(1998) argues that the marginalization and sense of grievance that Indian Sikhs were facing due to Indira Gandhi's heavy-handed tactics were amplified in the Sikh diaspora.Subsequently, the Sikh diaspora, especially in South Vancouver, Canada and the UK become willing suppliers of logistical and financial support when the organic agitation for a separate Sikh nation, Khalistan, began in the late 1970s.The actions taken by the Indian government to counter the Sikh separatist movement, via 1984's Operation Blue Star, had a seismic effect on the Sikh diaspora.