Roman Catholicism says the Blessed Eucharist or the Mass is an act of worship wherein the bread and wine are turned by the priest, who uses the power of God, into the body and blood of Jesus Christ who is true God and true man.
The Christians forbid notorious sinners to come to the Lord’s Table for Holy Communion. They are barred. And the Church bars them as in asks them to bar themselves.  This may be presented as recognising that a person has barred themselves.  So they are stealing something, insulting the loyal members, condoning hypocrisy and mocking God and following a personalised view of God to suit themselves should they take communion.  They may talk about being inclusive but they mean they are being inclusive towards themselves.  Real inclusion means respecting the rules of the religion instead of including yourself in it when you don't belong.
For Catholics the notorious sinners are:
People who live together in a state of fornication - whether gay or straight - are barred.
People who divorce their spouses and remarry other people.
Those Catholics who have married outside the Church say in register office or in a Mosque or in a same-sex marriage.
Heretics who are not ashamed to let the world know what they are.
Pro-choice politicians and activists.
LGBT activists.
Priests who left the ministry without permission.
Protestants - barred principally for disagreeing with the Church though they are considered to belong to the Catholic Church in the sense that their baptism gave them Church membership.

And many more.

Those who have some illness that prevents them receiving reverently are denied communion.  Nobody cares that the person could be too sick to understand and dies feeling rejected.

If you have some reason why you committed any of the above sins without full consent you are regarded as fit for going to communion but are warned to stay away even then to avoid giving the impression that the Church is blessing your sin by giving communion.

The Bible has Paul saying that whoever eats the bread and drinks the cup without recognising the body and blood of the Lord eats and drinks judgement to himself or herself.  They are guilty of the body and blood of the Lord.  Patrick Madrid in Where Does it say that in the Bible? page 113 states that being guilty of the body and blood of the Lord Jesus is a polite way of saying you murdered him. The idea is that since Jesus had to die to pay for our sins then sin is always murder.
The Catholic Church tells such people that they must not come to communion. People have been turned away from the altar for selling contraceptives and for campaigning for abortion. Most priests will give communion and meet with persons later to tell them to stay in their seats from now on. Many will bluntly refuse to give communion and make a scene. As those priests tend to be bullied and severely condemned on the radio and the internet and in the papers their numbers are diminishing. They only let notorious sinners have communion because they are afraid to refuse and not because they think they should.
The Church says that public sinners must be refused communion. It is referring to cases where the person only or mainly takes communion to set an example for others. It abets scandal or bad or sinful example. A public sinner is a person whose sin is quite public and made clearly and well known. For example, if a person tells the priest just before Mass that she is living in a sexual relationship and doesn't believe in marriage and he knows her sin is public he is obligated to refuse her communion.
An example of public sinners would be LGBT activists who go to communion to encourage people to scoff at and disobey Church teaching against LGBT activism and gay rights.
The Bible directs that sinners are not allowed to take communion and that those who do, eat and drink condemnation to themselves for they are profaning the Lord’s body and blood (1 Corinthians 11). It does God no harm to let them eat him. If you take the sacrament of confirmation in a state of serious sin it will not affect you and the grace it gives will not be conferred until you repent. It should be the same with the Eucharist. To bar anybody from communion is wrong. The Catholic Church has no right to call itself Catholic and the true Catholic Church for it is not catholic, that is universal, that is for all people.
Matthew 26 indicates that Judas received bread and wine at the last supper. Lukesays that after Jesus said the cup was his blood and invited all to partake he said  yet behold, the hand that betrayeth me is with me on the table. (Luke 21:21). So Judas was there and may have got communion. Jesus certainly invited him to take it but if he did is not known.
The Bible mentions Judas being given some bread by Jesus and told to go and betray him - this could be communion assuming that the last supper really was a communion service.
The 1917 Canon Law decreed,

Can 855 §1. Arcendi sunt ab Eucharistia publice indigni, quales sunt excommunicati, interdicti manifestoque infames, nisi de eorum poenitentia et emendatione constet et publico scandalo prius satisfecerint.
§2. Occultos vero peccatores, si occulte petant et eos non emendatos agnoverit, minister repellat; non autem, si publice petant et sine scandalo ipsos praeterire nequeat.

§2 But the minister bars occult sinners, if they seek [the sacrament] secretly and he does not know them to be amended; but not if they publicly seek it and he cannot pass over them without scandal.
So even secret sinners were refused communion even if they look for it in private. This law clearly was about protecting the Eucharist from defilement. It would be bizarre to argue that taking communion in a state of sin and estrangement from God is not as much sacrilege as giving others a bad example. In a sense, if they let themselves be inspired by your example that is their concern. 

Today's Canon Law decrees, Any baptized person not prohibited by law can and must be admitted to holy communion - Canon 912. This forbids Protestants and public sinners from communion.

In Catholicism, the priest has to intend to turn every wafer on the altar into God. It is sinful for a mortal sinner to eat any of the transformed wafers. The church should tell the priest not to intend to consecrate wafers that will end up going down the throats of mortal sinners but does not. Then she blames only the mortal sinner for desecrating the body of God as if her negligence and insistence that the priest must consecrate all the wafers, had nothing to do with it. Even if the wafer is not God the intention to trample on God is still there but the Church says it is bad enough to stay in sin and have this intention but worse to partake of the Lord’s Table.
If you receive the Eucharist or absolution in sin it is declared by the Church that you never get the grace even if you repent later. But you should if you would with any of the rest. To receive the sacrament in sin should not be the sin of trampling on grace for you can’t get any anyway but merely the sin of mocking a sacred symbol if it should be sinful at all. It should not be a sin in these ways at all if the intention you have is that the grace will be given to you when you turn to God. It would be better than nothing. And also, not going to communion because you want a sin to remain on your soul would be mocking it anyway.
The Church says that the Eucharist gives you the spiritual food that lasts forever. Jesus spoke of the bread that nourishes you for eternity. If that is true, then if you resist the graces when you take communion you should get the graces when you open yourself up to them. Catholic teaching denies that anybody anywhere has full access to God and his graces and gifts. That in itself makes it idolatrous.
It is evil to tell anyone, “You can’t receive our Lord so go away.”
Asking sinners to stay way from communion unless they repent and get God's pardon is a very judgmental attitude. Some people who live in a state of “sin” cannot be guilty of serious sin for they are too weak to stop. The Church is wrong to judge them. The unfairness of the whole thing is more than plain when it is seen that the Church teaches that it is wrong to judge. To do it herself is to sanction hypocrisy and hypocrisy is a very nasty insult against people who do judge and those who need to do it but are told not to. The priest who obeys the Vatican and withholds communion is a hypocrite. It is up to each person to examine themselves.
The Church says it can ban divorcees and homosexuals from communion not necessarily because it judges them but because it judges their lifestyle as unchristian or harmful and wants them to think about what they are doing and fix it and not give example to others to live the same way. You can judge a person as doing wrong without accusing that person of sin for the person could be mistaken. If people cannot accept this treatment then it is clear that they don’t care if they are right or wrong and/or want the Church to change what it believes just for them. But many beliefs cannot be changed without the Church ceasing to be the Church.

Perhaps it is wrong to refuse a sinner for it will hurt them and make them despise the Church. The sinner should not be resentful for they deserve it. The sinner should not have approached the altar. God can prevent the pain and the hatred and if they happen it is the sinner’s fault or God’s will that they feel this way. The Bible says that faith is a gift from God and that he has saved the lowest sinners by faith. This approach forbids attempts to argue the person into faith. It does not saying giving reasons to believe is wrong only that there will be no faith unless God gives it. The doctrine of faith being a supernatural gift rejects the notion that you really can put a person off faith in God. If God helps them to believe and exercise faith, their anger at you for refusing them communion will make no difference.
If there is no excuse for sending anybody who is in a grave state of sin away from the altar without communion then that says things about the Pope and the Vatican who command that that be done. The Holy Spirit if good is not inspiring the Vatican’s attitude. The pope and his men know fine well that they are being unjust for they are told often enough by progressive Catholics. 
Religion should not be taken seriously enough for anybody to even consider banning people from communion.
It is vindictive to condemn on religious grounds. We know that no truly good person condemns another say for not saying some kind of prayer or for not believing something in a holy book. The Eucharist is nasty balderdash.
The more people banned from Catholic communion the better!

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