instruction:
Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].
question:
The department's narcotics division began the investigation when a source told them about the group  officials said. The buys were conducted by undercover officers who infiltrated the group  according to Anthony Riccio  chief of the department's organized crime division.
 Riccio  said there are “dozens and dozens of these secret groups  a lot of them used for illegal things  including trafficking the guns and firearms. It's dozens of them out there.”
 He  said many of the guns had defaced serial numbers  making them difficult to trace. “These are guns that are winding up in the South Side  West Side of the city being used in gang shootings ”  Riccio  said.
 He  said the Facebook group selling guns and drugs would not be found by searching and that someone had to vouch for anyone who wanted to join them.
“I absolutely think Facebook has a responsibility to monitor this and for this very reason ”  Riccio  said. “There’s other illegal activities — I want to point out this is phase one — there's other illegal activities going on on Facebook. We're looking at potentially human trafficking  things of that nature as well. There's a lot of tentacles going out here.
answer:
Anthony Riccio


question:
Sen. Elizabeth Warren  D-Mass.  said Thursday that the Democratic primary last year was "fair " moving away from the comments she made last week.
"I agree with what Donna Brazile has said over the last few days; that while there was some bias at the DNC  the overall 2016 primary process was fair and Hillary [Clinton] made history  " Warren  said in an interview with MassLive.
Last week  when asked by CNN's Jake Tapper if the Democratic National Committee had been "rigged" to favor Clinton   Warren  answered  "yes."
 Elizabeth Warren : Yes [Link] pic.twitter.com/TjkBS0mbB8 â The Lead CNN (@TheLeadCNN) November 2  2017
"We've got to hold this party accountable " she continued. "When Tom Perez was elected to chair of the DNC  the very first conversation I had with him was to say  'You've got to put together a Democratic Party in which everybody can have confidence that the party is working for Democrats rather than Democrats working for the party.' "
A spokeswoman for  Warren  later told MassLive that  Warren  believes  as  she  said last week  that the DNC was rigged  but that the primary itself was not.
answer:
Elizabeth Warren


question:
On how bridge stakeouts near the Chattahoochee River led police to Wayne Williams in May 1981
Lindsey: A police recruit heard a splash down there in the water by the bridge  and that was FBI special agent Mike McComas  and he was in charge of the bridge stakeouts in Atlanta. And there were about 14  15 bridges they were staking out for 30 days. And this recruit hears a large splash  which he thinks is a body  shines his flashlight on the water but doesn't see anything — sees ripples. They see a car up there on the bridge. They stop it  and then they find  Wayne Williams . And you know  after that they begin to tail  Wayne Williams  and look into this guy.
Albright: Three days later  the body of Nathaniel Cater was found about 500 yards downriver. So that's what clued them into that that must be  you know  they theorized that was the body  he  dropped that night. It wasn't long after that  he  was arrested.
On the case that investigators built against  Wayne Williams
Lindsey: It was carpet fibers and dog hairs they were able to link from  Wayne Williams  —  his  car   his  home — to some of the victims. Besides that  everything else was mostly circumstantial. And  he  obviously had failed a couple of polygraph tests  but those were inadmissible in court. Besides that  they didn't have much against  him .
On why  Williams  was only convicted of the murders of two adults
Lindsey: The biggest question that surrounds that case is  "If  Wayne Williams  is the Atlanta Monster  is the Atlanta child murderer  then why was  he  only convicted of killing two adults?" And that's how the families feel  that's how some people in the community feel. It just doesn't add up all the way.
On what happened after  Williams  was arrested
Albright: And it was a shaky pattern to begin with. Some of these kids had stab wounds  some of them had genital mutilation  some of them were beaten with objects  some of them were just strangled. They were found in various places  various counties  so there's not a distinct pattern that you would think of  like when you  you know  people who are accustomed to watching serial killer movies or hearing about this serial killer calling card  there was nothing like that  that definitely tied Wayne Williams to all of these victims.
answer:

Wayne Williams