Australia's intelligence chief says foreign interference remains at its highest level in the country's history, threatening Australia's social cohesion. Multicultural communities are vulnerable to foreign interference, which involves clandestine, coercive and disruptive operations by foreign actors and their proxies infiltrating the diaspora. The government has previously singled out the Iranian regime as an offender, revealing a foreign interference plot which targeted an Iranian-Australian had been foiled by security agencies. This report looks at three communities in Australia whose members have told SBS News that cases of intimidation and spying are escalating - and becoming increasingly brazen.