I don’t see how a tax fraud in 2005 can be prosecuted in 2018. So, he is guilty of something that should have been over and done with 8-10 years ago, loooooong before there was a Trump run for president.
Now to get to the real crime, everyone of these charged citizens, not the Ruskies, has only one thing in common a connection with Trump. How one cannot see this is a witch hunt angers me beyond words. We now have a one man above the Constitution warlord now. He decides to undermine a president. Special Counsel, actually, a special a hole.
The five counts of tax evasion Manifort was convicted of were for 2010-2014, inclusive. The statute of limitations for tax evasion is 6 years, running (usually) from the date the tax return is filed (so the statute of limitations for 2010 started running in 2011).