Peaches Stergo, 36, met elderly man online in 2017, convinced him to transfer funds, which she used to live extravagantly while victim lost apartment

Prosecutors says HoggPool lured in clients with 'fraudulent' means, promised large returns, then abruptly stopped operations in February and disappeared with $620,000

Authorities say Yuri Dashevsky is part of an organized gang that from 2015 to 2019 persuaded investors to invest in fictitious financial instruments