With federal immigration sweeps showing no signs of slowing across Southern California, there is growing concern from top officials, spiritual leaders and business owners that a climate of fear was sending more people underground and changing the rhythm of city life.Once-bustling immigrant hubs, including MacArthur Park, the Garment District, downtown’s produce market and areas of the Eastside have seen a noticeable reduction in foot traffic over the last week, with some businesses forced to close as a result.It comes as social media is rife with videos of people spotting immigration agents at shopping centers, markets and neighborhood streets, and capturing...